BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel addresses the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel listens to debates after she addressed the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel listens to debates after she addressed the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel speaks with Minister of the Chancellery Peter Altmeier after she addressed the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel addresses the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel prepares to address the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel addresses the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JUNE 28: German Chancellor Angela Merkel listens to debates after she addressed the Bundestag with a government declaration on the recent Brexit vote on June 28, 2016 in Berlin, Germany. European leaders are scheduled to meet at a summit in Brussels later today to discuss the consequences of the British vote to leave the European Union. Merkel called the vote an unprecedented event in EU history but one the remaining 27 member states will weather. (Photo by Sean Gallup/Getty Images)