Resigning Federal Councillor Doris Leuthard (C) receives the applause of the members of the United Federal Assembly in the National Council Hall in Bern, Switzerland December 5, 2018. Marcel Bieri/Pool via REUTERS 

Outgoing Federal Councillor and Vice President Doris Leuthard and Federal Councillor Johann Schneider-Ammann attend the new ministerial elections in the Swiss Parliament in Bern, Switzerland December 5, 2018. REUTERS/Arnd Wiegmann 

Outgoing Federal Councillor and Vice President Doris Leuthard attends the new ministerial elections in the Swiss Parliament in Bern, Switzerland December 5, 2018. REUTERS/Arnd Wiegmann 

Outgoing Federal Councillor Johann Schneider-Ammann, Federal Councillor and Vice President Doris Leuthard and Swiss President Alain Berset attend the new ministerial elections in the Swiss Parliament in Bern, Switzerland December 5, 2018. REUTERS/Arnd Wiegmann 

Outgoing Federal Councillor Johann Schneider-Ammann and Federal Councillor and Vice President Doris Leuthard attend the new ministerial elections in the Swiss Parliament in Bern, Switzerland December 5, 2018. REUTERS/Arnd Wiegmann 

Swiss President Alain Berset and Swiss Federal Councillor Doris Leuthard say goodbye to Pope Francis after his visit in Geneva, Switzerland, June 21, 2018. Peter Klaunzer/Pool via REUTERS 

Swiss President Alain Berset and Swiss Federal Councillor Doris Leuthard talk to Pope Francis at the end of his visit in Geneva, Switzerland, June 21, 2018. Peter Klaunzer/Pool via REUTERS 

Pope Francis speaks with Swiss Federal Councilor Doris Leuthard before leaving after a one day visit at Cointrin airport in Geneva, Switzerland, June 21 2018. REUTERS/Denis Balibouse 

Swiss Federal Councillor Doris Leuthard speaks with a member of the Pontifical Swiss Guard, as Mauro Poggia, member of the government of the canton of Geneva (R) looks on, prior to the the Holy Mass held by Pope Francis at Palexpo hall in Geneva, Switzerland June 21, 2018. Martial Trezzini/Pool via REUTERS 

(R-L) Swiss Federal Councillor Doris Leuthard, Swiss President of the National Council, Dominique De Buman and deputy of the National Council Ada Marra, await Pope Francis who will celebrate the Holy Mass at Palexpo hall in Geneva, Switzerland June 21, 2018. Martial Trezzini/Pool via REUTERS 

Swiss Federal Councillor Doris Leuthard and Swiss President of the National Council Dominique De Buman await Pope Francis who will celebrate the Holy Mass at Palexpo hall in Geneva, Switzerland June 21, 2018. Martial Trezzini/Pool via REUTERS 

Swiss Federal President Alain Berset, 2nd from left, welcomes German President Frank-Walter Steinmeier, left, and their greet Swiss Federal Councillor Ueli Maurer and Doris Leuthard during his two days state visit to Switzerland, in Bern, Switzerland, April 25, 2018. KEYSTONE/Peter Schneider/Pool via REUTERS 

Swiss Federal President Doris Leuthard attends the One Planet Summit at the Seine Musicale center in Boulogne-Billancourt, near Paris, France, December 12, 2017. REUTERS/Benoit Tessier 

Georgia's President Georgy Margvelashvili (R) and his Swiss counterpart Doris Leuthard attend a news conference in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Switzerland's President Doris Leuthard speaks during a news conference in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Georgia's President Georgy Margvelashvili (R) and his Swiss counterpart Doris Leuthard leave after a news conference in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Switzerland's President Doris Leuthard speaks during a news conference in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Georgia's President Georgy Margvelashvili and his Swiss counterpart Doris Leuthard review honor guard during a welcoming ceremony in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Georgia's President Georgy Margvelashvili and his Swiss counterpart Doris Leuthard review honor guard during a welcoming ceremony in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Georgia's President Georgy Margvelashvili (R) and his Swiss counterpart Doris Leuthard walk during a welcoming ceremony in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Georgia's President Georgy Margvelashvili and his Swiss counterpart Doris Leuthard walk during a welcoming ceremony in Tbilisi, Georgia, December 4, 2017. REUTERS/David Mdzinarishvili 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa (not pictured) at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa (not pictured) at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard (C) visits the Jeronimos Monastery during the official welcoming ceremony in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard visits the tomb of Portuguese poet Luis de Camoes during the official welcoming ceremony at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard visits the tomb of Portuguese poet Luis de Camoes during the official welcoming ceremony at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard visits the tomb of Portuguese poet Luis de Camoes during the official welcoming ceremony at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard is welcomed by her Portuguese counterpart Marcelo Rebelo de Sousa at Jeronimos Monastery in Lisbon, Portugal November 28, 2017. REUTERS/Rafael Marchante 

Swiss President Doris Leuthard and Austria's President Alexander Van der Bellen walk through Van der Bellen's office at Hofburg palace in Vienna, Austria, November 27, 2017. REUTERS/Heinz-Peter Bader 

Swiss President Doris Leuthard and Austria's President Alexander Van der Bellen walk through Van der Bellen's office at Hofburg palace in Vienna, Austria, November 27, 2017. REUTERS/Heinz-Peter Bader 

Swiss President Doris Leuthard and Austria's President Alexander Van der Bellen pose in front of a painting of former Empress Maria Theresia at Hofburg palace in Vienna, Austria, November 27, 2017. REUTERS/Heinz-Peter Bader 

Swiss President Doris Leuthard and Austria's President Alexander Van der Bellen walk through Van der Bellen's office at Hofburg palace in Vienna, Austria, November 27, 2017. REUTERS/Heinz-Peter Bader 

Swiss President Doris Leuthard speaks during a news conference in Bern, Switzerland November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard gestures before meeting with European Commission President Jean-Claude Juncker in Bern, Switzerland November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker attend a news conference in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker leave after a news conference in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard listens as European Commission President Jean-Claude Juncker speaks during a news conference in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker attend a news conference in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker walk to attend a news conference in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker attend a news conference in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker walk to attend a news conference in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker attend a signing ceremony in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Ambassador of Estonia to Switzerland Rein Oidekivi, European Commission President Jean-Claude Juncker, Ambassador of the European Union to Switzerland Michael Mathiessen, Swiss President Doris Leuthard and Director of the Swiss Federal Office for the Environment Marc Chardonnens pose for a family photo during a signing ceremony in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker attend a signing ceremony in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker attend a signing ceremony in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker attend a signing ceremony in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard and European Commission President Jean-Claude Juncker arrive for a signing ceremony in Bern, Switzerland, November 23, 2017. REUTERS/Stefan Wermuth 

European Commission President Jean-Claude Juncker talks to the Swiss government with Federal President Doris Leuthard, Federal Councillor Alain Berset, and Federal Councillor Ignazio Cassis during Juncker's official visit in Bern, Switzerland, November 23, 2017. REUTERS/Peter Klaunzer/Pool 

European Commission President Jean-Claude Juncker talks to the Swiss government with Federal President Doris Leuthard, Federal Councillor Alain Berset, and Federal Councillor Ignazio Cassis during Juncker's official visit in Bern, Switzerland, November 23, 2017. REUTERS/Peter Klaunzer/Pool 

Swiss Federal President Doris Leuthard talks to European Commission President Jean-Claude Juncker during Juncker's official visit in Bern, Switzerland, November 23, 2017. REUTERS/Peter Klaunzer/Pool 

Swiss President Doris Leuthard welcomes European Commission President Jean-Claude Juncker in Bern, Switzerland November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard meets European Commission President Jean-Claude Juncker in Bern, Switzerland November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard meets European Commission President Jean-Claude Juncker in Bern, Switzerland November 23, 2017. REUTERS/Stefan Wermuth 

Swiss President Doris Leuthard welcomes European Commission President Jean-Claude Juncker in Bern, Switzerland November 23, 2017. REUTERS/Stefan Wermuth