London Mayor Sadiq Khan says Donald Trump’s “cruel and shameful” policies mean he should not be granted a state visit to Britain.

The mayor’s call came as British MPs prepare to debate the US President’s forthcoming trip to the UK.

Mr Khan said on Sunday that Trump’s travel ban aimed at people from seven Muslim-majority countries, which has run into trouble in the US courts, and the suspension of refugee admissions were reasons not to be “rolling out the red carpet”.

On Monday, MPs will debate rival petitions on the invitation extended by Prime Minister Theresa May to the US President to make a state visit, while protesters will gather outside Parliament House to speak out against Mr Trump.

Mr Khan, who is a Muslim, told UT broadcaster ITV on Sunday: “I love America, I love Americans and I believe the special relationship is a good one and one that’s here to stay”.

“But when you’re mates with somebody, when you’ve got a special relationship, of course you are side-by-side with them in times of adversity, but when they are wrong you call them out.”

He added: “I think this ban on people from seven Muslim-majority countries, ending the refugee program is cruel and it’s shameful”.

“In those circumstances we shouldn’t be rolling out the red carpet.”

Mrs May has been criticised for offering Mr Trump a state visit too soon in his already highly controversial presidency.

Theresa May has been criticised for inviting President Trump too soon. Source: AAP

Barack Obama only received an invitation after 758 days, while it took 978 days before his predecessor, George W Bush, was offered a state visit, compared with seven days for Mr Trump.

One petition to be debated by MPs on Monday was signed by more than 1.85 million people calling for the visit to be stripped of the trappings of a state occasion in order to avoid causing “embarrassment” to the Queen.

Parliament will also consider a rival petition, backed by 311,000 signatories, demanding that the visit goes ahead.