Stephen and Terri Mitchelle (left) of Maple Ridge and their children, who live in Bellingham, gather for Mother's Day along the Canada-U.S. border, closed to non-essential travel due to coronavirus disease (COVID-19) restrictions, in Langley, British Columbia, Canada May 10, 2020. REUTERS/Jennifer Gauthier

A U.S. border patrol agent takes a photograph of the Lopez Borja family of Maple Ridge and Everett, Washington, along the Canada-U.S. border, closed to non-essential travel due to the coronavirus disease (COVID-19) restrictions as the family gathered for Mother's Day in Langley, British Columbia, Canada May 10, 2020. REUTERS/Jennifer Gauthier

A truck leaves the Maple Lodge Farms chicken processing plant after the company said one worker had died and 25 tested positive for the coronavirus disease (COVID-19) in Brampton, Ontario, Canada May 7, 2020. REUTERS/Chris Helgren

A truck moves a refrigerated trailer at the Maple Lodge Farms chicken processing plant after the company said one worker had died and 25 tested positive for the coronavirus disease (COVID-19) in Brampton, Ontario, Canada May 7, 2020. REUTERS/Chris Helgren

A sign instructs personnel to declare if they are at risk of infection, at the reception door of the Maple Lodge Farms chicken processing plant after the company said one worker had died and 25 tested positive for the coronavirus disease (COVID-19) in Brampton, Ontario, Canada May 7, 2020. REUTERS/Chris Helgren

A truck arrives at the Maple Lodge Farms chicken processing plant after the company said one worker had died and 25 tested positive for the coronavirus disease (COVID-19) in Brampton, Ontario, Canada May 7, 2020. REUTERS/Chris Helgren

A man wearing a face mask walks past the entry gate after the company said one worker had died and 25 tested positive for the coronavirus disease (COVID-19) at the Maple Lodge Farms chicken processing plant in Brampton, Ontario, Canada May 7, 2020. REUTERS/Chris Helgren

A man waves from a convoy of hearses after a repatriation ceremony for six Canadian military personnel killed in a helicopter crash in the Mediterranean, as they pass under a large Maple Leaf flag hanging from an overpass on the Highway 401 in Toronto, Ontario, Canada May 6, 2020. REUTERS/Chris Helgren

Jane Maples carries flowers at her florist as the spread of the coronavirus disease (COVID-19) continues. Hertford, Britain March 22, 2020 REUTERS/Andrew Couldridge

Men prepare the disks of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Men prepare disks of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

A man holds disks of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Men prepare the burning disks of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Men throw burning disks of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Burning disks of maple wood lie in the fire during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Burning disks of maple wood are thrown during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Men throw burning disks of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Men prepare the burning discs of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Men throw burning disks of maple wood during a traditional event to drive the winter out, in Ehrwald, Austria February 29, 2020. REUTERS/Angelika Warmuth

Skaters pass a Maple Leaf sign as supporters of the indigenous Wet'suwet'en Nation's hereditary leaders attend a rally outside city hall in Toronto, Ontario, Canada February 22, 2020. REUTERS/Chris Helgren

A man holds a Mohawk Warrior flag near a Maple Leaf sign as supporters of the indigenous Wet'suwet'en Nation's hereditary leaders attend a rally outside city hall in Toronto, Ontario, Canada February 22, 2020. REUTERS/Chris Helgren

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to patrons at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) leaves the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) and New Hampshire Representative Ed Butler arrive at the Sweet Maple Cafe after visiting patrons in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to patrons at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

A patron holds his mug while waiting for Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) and New Hampshire Representative Ed Butler leave the Sweet Maple Cafe after visiting patrons in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) greets patrons at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to patrons at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to a patron at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to patrons at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to patrons at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) picks out a tea at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

The owners and staff of the Sweet Maple Cafe pray for Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) at the cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) talks to a patron at the Sweet Maple Cafe in Conway, New Hampshire, U.S., February 10, 2020. REUTERS/Brian Snyder TPX IMAGES OF THE DAY

People assemble for a caucus at the Maple Grove Methodist church in West Des Moines, Iowa, U.S. February 3, 2020. REUTERS/Jim Bourg

A caucus script is seen at the Maple Grove Methodist church in West Des Moines, Iowa, U.S. February 3, 2020. REUTERS/Jim Bourg

People assemble for a caucus at the Maple Grove Methodist church in West Des Moines, Iowa, U.S. February 3, 2020. REUTERS/Jim Bourg

Participants gather as the caucus begins at Maple Grove Methodist Church in West Des Moines, Iowa, U.S., February 3, 2020. REUTERS/Jim Bourg

Free candy left on seats by supporters of Democratic presidential candidate and former Vice President Joe Biden to lure people to gather with them is seen at Maple Grove Methodist Church in West Des Moines, Iowa, U.S., February 3, 2020. REUTERS/Jim Bourg

The Holy Bible lies open on the altar as the caucus begins at Maple Grove Methodist Church in West Des Moines, Iowa, U.S., February 3, 2020. REUTERS/Jim Bourg

Democratic presidential candidate and former Vice President Joe Biden and Democratic presidential candidate Pete Buttigieg precinct captains, joke together at a caucus at the Maple Grove Methodist church in West Des Moines, Iowa, U.S. February 3, 2020. REUTERS/Jim Bourg

Rebel Codi, a supporter of Democratic presidential candidate Senator Bernie Sanders, tries to draw supporters over to the Sanders area of the Maple Grove Methodist Church in West Des Moines, Iowa, U.S., February 3, 2020. REUTERS/Jim Bourg

People arrive at a caucus at the Maple Grove Methodist church in West Des Moines, Iowa, U.S. February 3, 2020. REUTERS/Jim Bourg

People arrive at a caucus at the Maple Grove Methodist church in West Des Moines, Iowa, U.S. February 3, 2020. REUTERS/Jim Bourg

Red and golden maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Red and golden maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Red maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Red and green maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Red and green maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Red maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Red maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Red maple leaves colour the autumn countryside in Cantin village, northern France, October 13, 2019. Picture taken, October 13, 2019. REUTERS/Pascal Rossignol

Rugby Union - Rugby World Cup - Canada Captain's Run - Fukuoka Hakatanomori Stadium, Fukuoka, Japan - September 25, 2019. Maple leaf design is seen on the socks of Canada's Daniel Tailliferre Hauman van der Merwe during the Captain's Run. REUTERS/Issei Kato

Villagers take part in a rite called "Vadzhenne kusta" or "Leading the bush", an old slavic tradition with a key player dressed in branches of maple, in the village of Lobcha, Belarus June 17, 2019. REUTERS/Vasily Fedosenko

A girl takes part in a rite called "Vadzhenne kusta" or "Leading the bush", an old slavic tradition with a key player dressed in branches of maple, in the village of Lobcha, Belarus June 17, 2019. REUTERS/Vasily Fedosenko

Villagers visit their friend's grave during a rite called "Vadzhenne kusta" or "Leading the bush", an old slavic tradition with a key player dressed in branches of maple, in the village of Lobcha, Belarus June 17, 2019. REUTERS/Vasily Fedosenko

Villagers take part in a rite called "Vadzhenne kusta" or "Leading the bush", an old slavic tradition with a key player dressed in branches of maple, in the village of Lobcha, Belarus June 17, 2019. REUTERS/Vasily Fedosenko

Villagers take part in a rite called "Vadzhenne kusta" or "Leading the bush", an old slavic tradition with a key player dressed in branches of maple, in the village of Lobcha, Belarus June 17, 2019. REUTERS/Vasily Fedosenko

Villagers take part in a rite called "Vadzhenne kusta" or "Leading the bush", an old slavic tradition with a key player dressed in branches of maple, in the village of Lobcha, Belarus June 17, 2019. REUTERS/Vasily Fedosenko