Austin: The magazine founded by the late Reverend Billy Graham that is influential with conservative evangelical Christians in the United States called on Thursday for President Donald Trump to be removed from office.

US President Donald Trump was impeached in the House. Credit:AP

Christianity Today wrote in an editorial carrying the headline "Trump Should Be Removed from Office" that it could no longer stand on the sidelines following Trump's impeachment.

"The president of the United States attempted to use his political power to coerce a foreign leader to harass and discredit one of the president's political opponents," the editorial read. "That is not only a violation of the Constitution; more importantly, it is profoundly immoral."

Evangelical Christians make up about 25 per cent of US voters, according to Pew Research, and have been a bedrock of Trump's support. In 2016, he took over 80 per cent of the group's votes, per Pew's polling.