The White House is considering dramatically expanding its much-litigated travel ban to additional countries amid a renewed election-year focus on immigration by United States President Donald Trump, according to six people familiar with the deliberations.

A document outlining the plans - timed to coincide with the third anniversary of Trump's January 2017 executive order - has been circulating in the White House. But the countries that would be affected are blacked out, according to two of the people, sources who spoke to the Associated Press on condition of anonymity because the measure has yet to be finalised.

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It is unclear exactly how many countries would be included in the expansion, but two of the sources said that seven countries - the majority of which are majority Muslim - would be added to the list. The most recent iteration of the ban includes restrictions on five majority-Muslim nations: Iran, Libya, Somalia, Syria and Yemen, as well as Venezuela and North Korea.

A different source said the expansion could focus on several countries that were included when Trump announced the first iteration of the ban but that were later removed amid rounds of contentious litigation. Iraq, Sudan and Chad, for instance, had originally been affected by the order, which the US Supreme Court upheld in a 5-4 vote after the administration released a watered-down version intended to withstand legal scrutiny.

Trump later criticised the US Department of Justice for the changes.

The White House did not immediately respond to questions about the effort, which several of the sources said was timed for release in conjunction with the third anniversary of Trump's first travel ban.

That order sparked an uproar when it was announced on January 27, 2017, with massive protests across the nation and chaos at airports where passengers were detained.

People protest Trump's first iteration of the travel ban [File: Tony Gentile/ Reuters]

The latest deliberations come as House Speaker Nancy Pelosi prepares to transmit to the Senate the articles of impeachment that the Democratic-led House passed in the US Congress against Trump late last year, launching a formal impeachment trial just as the 2020 election year gets underway. Trump in December became just the third president in history to be impeached by the House. The Republican-controlled Senate is not expected to remove him from office.

Trump ran his 2016 campaign promising to crack down on immigration and spent much of his first term fighting lawsuits trying to halt his push to build a wall along the southern border with Mexico, prohibit the entry of citizens from several majority-Muslim countries and crack down on migrants seeking asylum in the US, amid other measures.

He is expected to press those efforts again this year as he ramps up his re-election campaign.

Just this week, a coalition of leading civil rights organisations urged House leaders to take up the No Ban Act, legislation to end Trump's travel ban and prevent a new one.

The bill, introduced last year by Representative Judy Chu in the House and Senator Chris Coons in the Senate, would impose limits on the president's ability to restrict entry to the US. It would require the administration to spell out its reasons for the restrictions and specifically prohibit religious discrimination.

Trump's revised ban eliminated some of the original's most contentious provisions, including making clear that those who held visas at the time of the signing could continue to enter the country.