U.S. Comptroller of the Currency Thomas Curry answers a question during the Reuters Financial Regulation Summit in Washington May 16, 2016. REUTERS/Carlos Barria

Football Soccer - Paris Saint-Germain v Arsenal - UEFA Champions League Group Stage - Group A - Parc des Princes, Paris, France - 13/9/16 Former French President Nicolas Sarkozy in the stands Reuters / Gonzalo Fuentes Livepic

Senator Robert Menendez in Washington July 23, 2015. REUTERS/Gary Cameron/File Photo

European Council President Donald Tusk (3rdL), European Commission President Jean-Claude Juncker (2ndR) and European Parliament President Martin Schulz (L) pose for a group photo with Slovakia's Prime Minister Robert Fico (C), Slovakia's President Andrej Kiska (3rdR) and Speaker of the Slovakia's National Council Andrej Danko (2ndL) at the Government office ahead of the upcoming European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 15, 2016. REUTERS/Yves Herman

European Council President Donald Tusk (R) is welcomed by Slovakia's Prime Minister Robert Fico at the Government office ahead of an upcoming European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 15, 2016. REUTERS/Yves Herman

European Parliament President Martin Schulz (L) is welcomed by Slovakia's Prime Minister Robert Fico at the Government office ahead of the upcoming European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 15, 2016. REUTERS/Yves Herman

European Council President Donald Tusk arrives at the Government office ahead of the upcoming European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 15, 2016. REUTERS/Yves Herman

European Council President Donald Tusk (3rdL), European Commission President Jean-Claude Juncker (2ndR) and European Parliament President Martin Schulz (L) pose for a group photo with Slovakia's Prime Minister Robert Fico (C), Slovakia's President Andrej Kiska (3rdR) and Speaker of the Slovakia's National Council Andrej Danko (2ndL) at the Government office ahead of an upcoming European Union summit- the first one since Britain voted to quit- in Bratislava, Slovakia, September 15, 2016. REUTERS/Yves Herman