Kate Solecki, Visitor Program Manager at the Royal Botanic Gardens, poses for a photograph in the sand dune ‘Plantscape’ exhibit which is part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Kate Solecki, Visitor Program Manager at the Royal Botanic Gardens, poses for a photograph in the sand dune ‘Plantscape’ exhibit which is part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Kate Solecki, Visitor Program Manager at the Royal Botanic Gardens, poses for a photograph in the sand dune ‘Plantscape’ exhibit which is part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Kate Solecki, Visitor Programmes Manager at the Royal Botanic Gardens, poses for a photograph on ‘Please Be Seated’, an installation by Paul Cocksedge as part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Kate Solecki, Visitor Programmes Manager at the Royal Botanic Gardens, poses for a photograph on ‘Please Be Seated’, an installation by Paul Cocksedge as part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Kate Solecki, Visitor Programmes Manager at the Royal Botanic Gardens, poses for a photograph on ‘Please Be Seated’, an installation by Paul Cocksedge as part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Kate Solecki, Visitor Programmes Manager at the Royal Botanic Gardens, poses for a photograph on ‘Please Be Seated’, an installation by Paul Cocksedge as part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Kate Solecki, Visitor Programmes Manager at the Royal Botanic Gardens, poses for a photograph on ‘Please Be Seated’, an installation by Paul Cocksedge as part of the Secret World of Plants festival at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

The hedgerow ‘Plantscape’ exhibit of the Secret World of Plants festival is pictured at Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Holly Elson, Visitor Programmes Manager at Royal Botanic Gardens, poses for a photograph in the hedgerow 'plantscape' exhibit of the Secret World of Plants festival, at the Kew Gardens in London, Britain, May 6, 2021. REUTERS/John Sibley

Members of a U.S. Secret Service counter-terrorism team are pictured at Yorktown Elementary School during a visit of U.S. President Joe Biden and first lady Jill Biden, in Yorktown, Virginia, U.S. May 3, 2021. REUTERS/Jonathan Ernst

Members of a U.S. Secret Service counter-terrorism team are pictured at Yorktown Elementary School during a visit of U.S. President Joe Biden and first lady Jill Biden, in Yorktown, Virginia, U.S. May 3, 2021. REUTERS/Jonathan Ernst

A Secret Service agent conducts a security sweep of visitors to St. Joseph on the Brandywine Catholic Church while U.S. President Joe Biden attends services in Wilmington, Delaware, U.S. in Washington, U.S., May 1, 2021. REUTERS/Erin Scott

A Secret Service agent conducts a security sweep of visitors to St. Joseph on the Brandywine Catholic Church while U.S. President Joe Biden attends services in Wilmington, Delaware, U.S. in Washington, U.S., May 1, 2021. REUTERS/ERIN SCOTT

A Secret Service agent guards the entrance to St. Joseph on the Brandywine Catholic Church while U.S. President Joe Biden attends services in Wilmington, Delaware, U.S. in Washington, U.S., May 1, 2021. REUTERS/Erin Scott

A U.S. Secret Service Agent dusts off the presidential limousine as U.S. President Joe Biden arrived at Lawson Army Airfield in Fort Benning, Georgia, U.S., April 29, 2021. REUTERS/Evelyn Hockstein REFILE - CORRECTING LOCATION

A U.S. Secret Service Agent dusts off the presidential limousine as U.S. President Joe Biden arrived at Lawson Army Airfield in Fort Benning, Georgia, U.S., April 29, 2021. REUTERS/Evelyn Hockstein REFILE - CORRECTING LOCATION

A U.S. Secret Service Agent dusts off the presidential limousine as U.S. President Joe Biden arrived at Lawson Army Airfield in Fort Benning, Georgia, U.S., April 29, 2021. REUTERS/Evelyn Hockstein REFILE - CORRECTING LOCATION

The sun reflects off the White House as a secret service agent walks past prior to President Joe Biden's speech before the Joint Session of Congress in Washington, U.S., April 28, 2021. REUTERS/Evelyn Hockstein

The sun reflects off the White House as a secret service agent walks past prior to President Joe Biden's speech before the Joint Session of Congress in Washington, U.S., April 28, 2021. REUTERS/Evelyn Hockstein

A United States Secret Service Agent carries a riot shield across the West Wing driveway at the White House in Washington, U.S., April 20, 2021. REUTERS/Tom Brenner

A United States Secret Service Agent carries a riot shield across the West Wing driveway at the White House in Washington, U.S., April 20, 2021. REUTERS/Tom Brenner

A United States Secret Service Agent directs the landing of Marine One, ahead of U.S. President Joe Biden's departure to Delaware, at President?s Park in Washington, U.S., April 16, 2021. REUTERS/Tom Brenner

Guests ride on "Secret Life of Pets: off the Leash!" on reopening day of Universal Studios Hollywood during the outbreak of the coronavirus disease (COVID-19), in Universal City, California, U.S., April 15, 2021. REUTERS/Mario Anzuoni

Guests ride and interact on "Secret Life of Pets: off the Leash!" on reopening day of Universal Studios Hollywood during the outbreak of the coronavirus disease (COVID-19), in Universal City, California, U.S., April 15, 2021. REUTERS/Mario Anzuoni

Guests ride and interact on "Secret Life of Pets: off the Leash!" on reopening day of Universal Studios Hollywood during the outbreak of the coronavirus disease (COVID-19), in Universal City, California, U.S., April 15, 2021. REUTERS/Mario Anzuoni

A United States Secret Service Agent stands guard along Pennsylvania Avenue as the motorcade of U.S. first lady Jill Biden passes along Pennsylvania Avenue outside the White House in Washington, U.S., April 7, 2021. REUTERS/Tom Brenner

People pass a window display at a branch of Victoria's Secret in New Bond Street in London, Britain, March 31, 2021. REUTERS/Toby Melville

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai, United Arab Emirates - March 27, 2021 Secret Ambition ridden by T P OʼShea in action during the 12:15 Godolphin Mile REUTERS/Christopher Pike

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai, United Arab Emirates - March 27, 2021 T P OʼShea celebrates winning the 12:15 Godolphin Mile on Secret Ambition REUTERS/Christopher Pike

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai, United Arab Emirates - March 27, 2021 Secret Ambition ridden by T P OʼShea in action during the 12:15 Godolphin Mile REUTERS/Christopher Pike

A Secret Service agent walks among motorcade vehicles parked at St. Patrick's Church as U.S. President Joe Biden attends a morning service in Wilmington, Delaware, U.S., March 17, 2021. REUTERS/Kevin Lamarque

Members of the military and secret service prepare for the arrival of President Joe Biden and First Lady Jill Biden at the Air National Guard military base in New Castle, Delaware, U.S., on March 12, 2021. REUTERS/Sarah Silbiger

A member of the Secret Service secures the residential entrance area outside Trump Tower ahead of former U.S. President Donald Trump's scheduled visit to New York, in the Manhattan borough of New York City, New York, U.S., March 7, 2021.?REUTERS/Caitlin Ochs.

A Secret Service agent stands guard as U.S. President Joe Biden attends Holy Trinity Catholic Church in Washington, U.S. March 6, 2021. REUTERS/Erin Scott

U.S. President Joe Biden is seen through a doorway manned by a U.S. Secret Service agent as the president holds a meeting on infrastructure with members of Congress in the Oval Office at the White House in Washington, U.S., March 4, 2021. REUTERS/Tom Brenner

U.S. Secret Service Agents stand guard beside a mannequin display, as U.S. Vice President Kamala Harris discusses economic recovery plans with small business owners in Alexandria, Virginia, U.S., March 3, 2021. REUTERS/Tom Brenner

A Secret Service officer walks on the White House grounds in Washington, U.S., February 27, 2021. REUTERS/Joshua Roberts

U.S. Vice President Mike Pence looks back as he is rushed out of a secure room and evacuated from the U.S. Capitol on January 6 by his U.S. Secret Service security detail in a still photo from U.S. Capitol Security footage that was introduced as evidence by House impeachment managers during the impeachment trial of former President Donald Trump, on charges of inciting the deadly attack on the U.S. Capitol, on Capitol Hill in Washington, U.S., February 10, 2021. U.S. Senate/Handout via Reuters

A man casts his vote at a polling station during the presidential election, in Quito, Ecuador February 7, 2021. The writing on the ballot box reads "The vote is secret." REUTERS/Santiago Arcos

Electoral workers prepare a polling station before opening it for voters during the presidential election, in Quito, Ecuador February 7, 2021. The writing on the ballot box reads "The vote is secret." REUTERS/Santiago Arcos

Electoral workers assemble a ballot box with the writing "The vote is secret" before opening a polling station during the presidential election, in Quito, Ecuador February 7, 2021. REUTERS/Santiago Arcos

A woman casts her vote at a polling station during the presidential election, in Quito, Ecuador February 7, 2021. The writing on the ballot boxes read "The vote is secret." REUTERS/Santiago Arcos

A woman casts her vote at a polling station during the presidential election, in Quito, Ecuador February 7, 2021. The writing on the ballot box reads "The vote is secret." REUTERS/Santiago Arcos

A man casts his vote at a polling station during the presidential election, in Quito, Ecuador February 7, 2021. The writing on the ballot box reads "The vote is secret." REUTERS/Santiago Arcos

A woman casts her vote at a polling station during the presidential election, in Quito, Ecuador February 7, 2021. The writing on the ballot box reads "The vote is secret." REUTERS/Santiago Arcos

A man casts his vote at a polling station during the presidential election, in Quito, Ecuador February 7, 2021. The writing on the ballot boxes reads "The vote is secret." REUTERS/Santiago Arcos REFILE - CORRECTING CITY

A United States Secret Service Agent walks across the West Wing Driveway following a snow storm, at the White House in Washington, U.S., February 1, 2021. REUTERS/Tom Brenner

Secret Service members stand guard as U.S. President Joe Biden visits Holy Trinity Catholic Church in Washington, U.S., January 24, 2021. REUTERS/Erin Scott

A member of the Secret Service holds a sniper rifle on a rooftop overlooking the Inauguration Day parade for U.S. President Joe Biden in Washington, U.S., January 20, 2021. REUTERS/Erin Scott

A U.S. Secret Service agent changes the license plate on President Joe Biden's limousine near the North Portico of the White House in Washington, DC, U.S. January 20, 2021. Alex Brandon/Pool via REUTERS

A member of the secret service is seen ahead of U.S. President-elect Joe Biden's Presidential Inauguration near White House, in Washington, U.S., January 20, 2021. REUTERS/Callaghan O'Hare

U.S. Secret Service members check bags of people in a check point near the White House ahead of U.S. President-elect Joe Biden's inauguration, in Washington, U.S., January 20, 2021. REUTERS/Eduardo Munoz

U.S. Secret Service members check bags of people in a check point near the White House ahead of U.S. President-elect Joe Biden's inauguration, in Washington, U.S., January 20, 2021. REUTERS/Eduardo Munoz

A Secret Service agent walks towards The Air Force One before the departure ceremony of U.S. President Donald Trump at the Joint Base Andrews, Maryland, U.S., January 20, 2021. REUTERS/Carlos Barria

Members of the secret service monitor the scene as preparations are made ahead of U.S. President-elect Joe Biden's Presidential Inauguration in front of the White House, in Washington, U.S., January 19, 2021. REUTERS/Callaghan O'Hare

A member of the secret service monitors as preparations are made ahead of U.S. President-elect Joe Biden's Presidential Inauguration in front of the White House, in Washington, U.S., January 19, 2021. REUTERS/Callaghan O'Hare

Secret Service agents walk alongside a limousine carrying U.S. President Donald Trump as it passes empty viewing bleachers as he participates in the inaugural parade after his swearing in at the Capitol in Washington, U.S., January 20, 2017. REUTERS/Carlos Barria SEARCH "BARRIA POSTCARDS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A secret service officer is seen next to a motorcade transporting U.S. President Donald Trump from his golf course to a campaign event in Orlando, Florida U.S., June 18, 2019. REUTERS/Carlos Barria SEARCH "BARRIA POSTCARDS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A combination picture shows (L-R) general view of attendees at the presidential inauguration of President-elect Donald Trump at the U.S. Capitol in Washington, January 20, 2017, birds flying after President Trump was sworn in on the inaugural day in Washington, January 20, 2017, Secret Service agents walking alongside President Trump's limousine as it passes empty viewing bleachers as he participates in the inaugural parade after his swearing in at the Capitol, January 20, 2017, and outgoing U.S. President Barack Obama and outgoing first lady Michelle Obama watching as U.S. President Donald Trump embraces members of his family, wife Melania, and children Barron, Donald, Ivanka and Tiffany, after he was sworn in during inauguration ceremonies at the Capitol in Washington, U.S., January 20, 2017. REUTERS/Carlos Barria SEARCH "BARRIA POSTCARDS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES