Britain's EU partners agree guidelines for post-Brexit ties

European Council President Donald Tusk speaks during a media conference at an EU summit at the Europa building in Brussels on Thursday, March 22, 2018. Leaders from the 28 European Union nations meet for a two-day summit to assess the state of Brexit negotiations, the prospect of a trade war with the United States and how to react to Russia following to the nerve agent attack in Britain. (AP Photo/Olivier Matthys)
European Union chief Brexit negotiator Michel Barnier, left, kisses the hand of British Prime Minister Theresa May as they arrive for an EU summit at the Europa building in Brussels on Friday, March 23, 2018. Leaders from the 28 European Union nations meet for a second day of an EU summit to assess the state of Brexit negotiations and the prospect of a trade war with the United States. (AP Photo/Virginia Mayo)
British Prime Minister Theresa May gets into her car as she leaves an EU summit in Brussels on Friday, March 23, 2018. Leaders from the 28 European Union nations meet for a two-day summit to assess the state of Brexit negotiations, the prospect of a trade war with the United States and how to react to Russia following to the nerve agent attack in Britain. (AP Photo/Geert Vanden Wijngaert)
British Prime Minister Theresa May gets into her car as she leaves an EU summit in Brussels on Friday, March 23, 2018. Leaders from the 28 European Union nations meet for a two-day summit to assess the state of Brexit negotiations, the prospect of a trade war with the United States and how to react to Russia following to the nerve agent attack in Britain. (AP Photo/Geert Vanden Wijngaert)

Britain's EU partners agree guidelines for post-Brexit ties

European Council President Donald Tusk speaks during a media conference at an EU summit at the Europa building in Brussels on Thursday, March 22, 2018. Leaders from the 28 European Union nations meet for a two-day summit to assess the state of Brexit negotiations, the prospect of a trade war with the United States and how to react to Russia following to the nerve agent attack in Britain. (AP Photo/Olivier Matthys)
European Union chief Brexit negotiator Michel Barnier, left, kisses the hand of British Prime Minister Theresa May as they arrive for an EU summit at the Europa building in Brussels on Friday, March 23, 2018. Leaders from the 28 European Union nations meet for a second day of an EU summit to assess the state of Brexit negotiations and the prospect of a trade war with the United States. (AP Photo/Virginia Mayo)
British Prime Minister Theresa May gets into her car as she leaves an EU summit in Brussels on Friday, March 23, 2018. Leaders from the 28 European Union nations meet for a two-day summit to assess the state of Brexit negotiations, the prospect of a trade war with the United States and how to react to Russia following to the nerve agent attack in Britain. (AP Photo/Geert Vanden Wijngaert)
British Prime Minister Theresa May gets into her car as she leaves an EU summit in Brussels on Friday, March 23, 2018. Leaders from the 28 European Union nations meet for a two-day summit to assess the state of Brexit negotiations, the prospect of a trade war with the United States and how to react to Russia following to the nerve agent attack in Britain. (AP Photo/Geert Vanden Wijngaert)