The visit will “affirm the United States’ unwavering support for Ukraine’s sovereignty”, according to the White House.
The European powers are working on a UN proposal.
Candidates of CDU, SPD and the Greens took part in the first debate before the election.
Since the beginning of the year, some 14,000 migrants have been stopped at the Bulgarian border.
Michel Barnier plans to stand as a right-wing candidate againt President Macron.
Poland and Latvia have refused to allow the migrants from Belarus to cross their borders.
EU Commission dismisses the European Parliament’s call for action.
This is the first time that the SPD is ahead of the CDU/CSU since October 2006.
The British prime minister is to urge world leaders to step up support for refugees fleeing the Taliban in Afghanistan when he chairs a virtual G7 meeting later.
“We agree with the Americans that gas should not be used as a geopolitical weapon,” the German chancellor said.
