Donald Trump’s hopes of avoiding a Republican wipeout at the mid-term elections have markedly improved on the back of foreign policy wins and a booming economy.

One poll has put the Democrats just three points ahead of the Republicans, down from a 16-point lead in February, with the president’s approval ratings ticking up.

Meanwhile the turnaround in the North Korea stand-off, with a meeting between Mr Trump and Kim Jong-un scheduled and three US detainees returned, has stumped critics.

There are also signs that enthusiasm among Trump supporters for getting out to vote in the November congressional elections is on the rise - crucial for turnout.

Republican strategists have told The Daily Telegraph they are feeling much more upbeat about their prospects for keeping control of the Senate come November.

Some believe voters are taking little interest in the Russian election meddling investigation and White House personnel controversies dominating coverage from Washington.