Birds of a feather. They're both a little (a lot) quirky and neither seems to have much grasp of reality. In Donald Trump's case that goes for just about everything. In the British prime minister's case that centers on Brexit.
The European Union has been clear about its bottom line. First things first - Brexit and, only when that's wrapped, negotiations for some trade deal with the UK or whatever remains of it. The Tory prime minister insists on hammering out the trade deal at the same time.
May just entertained EU president Juncker at 10 Downing. Afterward Juncker reportedly raced to telephone Angela Merkel to warn that May was "living in another galaxy."
May asked Juncker and his colleagues for Brexit negotiations to take place in confidential four-day sessions each month. But she was told confidentiality would be impossible given the need to keep member states and the European Parliament informed.
May was optimistic in the meeting, saying "Let us make Brexit a success." Juncker countered that "Brexit cannot be a success," given its position as a third state.
"A third-party state cannot enjoy the same advantages or be better positioned than an EU member. I have the feeling that some people in Britain maintain illusions in this regard. They're wasting their time," Merkel told the German parliament on Thursday.
A UK government spokesman said in a statement on Monday: "We do not recognise this account. As the prime minister and Jean-Claude Juncker made clear, this was a constructive meeting ahead of the negotiations formally getting under way."
Time does not appear to be on May's side. With Scotland demanding another referendum and facing the prospect that Northern Ireland could choose to join the Irish Republic in order to remain in the EU, a rocky Brexit could weaken her ability to keep the United Kingdom united.