Maltese Prime Minister Joseph Muscat (L), Hungary's Prime Minister Victor Orban (2nd L), Germany's Chancellor Angela Merkel and Austria's Chancellor Christian Kern (R) arrive to pose for a family photo during the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Leonhard Foeger

European Union countries flags are seen at the Bratislava Castle (Hrad) during the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Yves Herman

European Union leaders pose for a family photo during the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Leonhard Foeger

(L-R) Slovakia's Prime Minister Robert Fico, Finland's Prime Minister Juha Sipila, Swedens's Prime Minister Stefan Lofven and Lithuania's President Dalia Grybauskaite arrive to pose for a family photo during the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Leonhard Foeger

European Union leaders pose for a family photo during the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Leonhard Foeger

Greece's Prime Minister Alexis Tsipras (C), Germany's Chancellor Angela Merkel and Portugal's Prime Minister Antonio Costa (R) arrive to pose for a family photo during the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Leonhard Foeger

Hungary's Prime Minister Victor Orban arrives to pose for a family photo during the European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 16, 2016. REUTERS/Leonhard Foeger

A stands outside Fannie Mae headquarters in Washington February 21, 2014. REUTERS/Kevin Lamarque