The man the Trump administration has put forward to coordinate billions of dollars in assistance to migrants is alleged to have said on Twitter that Islam is a violent religion and that Christians should be given preferential treatment.

The Washington Post says it has reviewed tweets, social media posts and radio appearances by Ken Isaacs, a vice president of the Christian relief organisation Samaritan’s Purse, and found a number of derogatory comments about Muslims.

The US media organisation claims that in June last year, following the terrorist attack in London Bridge, Mr Isaacs commented on a CNN International story claiming that the attack was “exactly what the Muslim faith instructs the faithful to do”.

In another tweet he is alleged to have said: “If Islam is a religion of peace, let’s see 2 million Muslims in National Mall marching against jihad & stand for America! I haven’t seen it!”

And in response to Barack Obama’s position on Syrian refugee relief in 2015, Mr Isaacs tweeted: “Refugees are 2grps. Some may go back and some can’t return. Christians can never return. They must be 1st priority.”

Mr Isaacs has since made his Twitter account private, but screenshots of his tweets are being shared on the social networking site.