Both believe in the sovereignty of the nation/state. There are those in Europe who think these two are a dangerous alliance.

Brietbart text:  The Prime Minister’s staff organising next week’s ‘working visit’ are working to prevent President Donald Trump from having a meeting with Brexit leader Nigel Farage, according to claims made Tuesday.

Unnamed Whitehall sources quoted in Britain’s Daily Telegraph print edition claim Farage — who was the first UK politician to meet with President Trump after his election — was a “red line” in visit negotiations with the White House, and that Downing Street officials had ordered that Trump “must not meet Farage” in the United Kingdom.
The paper reports a Downing Street source denied they were moving to prevent Mr Farage and President Trump meeting again.