The speaker of Britain's lower house of parliament has declared he will not support any plans for US President Donald Trump to address parliament during a state visit planned for later this year, citing Trump's temporary immigration ban as a factor.

More than 1.8 million people in Britain have signed a petition calling for Trump's planned visit to be cancelled or downgraded to avoid embarrassing Queen Elizabeth, part of a grassroots backlash against his immigration policies.

Prime Minister Theresa May has defended the decision to offer a state visit, but more than 150 lawmakers have signed a symbolic motion calling for Trump not to be given the honour of speaking in parliament.

Asked by an opposition Labour lawmaker about the possibility of a parliamentary address, House of Commons speaker John Bercow said he shared the concerns.

As one of the key figures whose approval would be needed for a parliamentary address, Bercow said he would oppose any possible move to invite Trump to speak in either of the two locations which host foreign leaders during state visits.

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