Donald Trump has been widely criticised for suggesting at a political rally that anyone who was not a Christian conservative could be booted from the room.

The Republican presidential candidate was speaking in Waukesha, Wisconsin.

He held up a sign with a blue background reading: "Christian Conservatives For Trump. Make America Great Again." 

He told the cheering crowd: "We have our Christian conservatives for Trump today. And they're in the room. Let's go. That's what we want. That's beautiful."  

He said: "Raise your hand. Christian coservatives. Everybody."

The room then went almost silent when he continued: "Raise your hand if you're not a Christian conservative. I want to see this. Right."

He paused and looked around until he spotted a few hands. "That is a couple of people. That's alright. I think we'll keep them, right? Shall we keep them in the room? I think so."

Christians and others took to Twitter to criticise Trump for his remarks.

Billy Byler, young adults pastor at Wichita First Church of the Nazarene in Kansas, tweeted:

Alan Pierce tweeted:

Terrance Carroll, attorney, rancher and former speaker of the Colorado House of Representatives, tweeted: 

Christian author Philip Yancey recently slammed pastors who support Trump and said he was "staggered" that some Christians saw him as a hero.

Yancey said Trump was a "bully who made his money by casinos" and "a person who stands against everything that Christianity believes".

He said he was baffled by evangelical support for Trump.