US President Donald Trump's new immigration order will remove Iraq from the list of countries whose citizens face a temporary US travel ban, officials said Tuesday, citing the latest draft in circulation.

Trump is expected to sign the executive order in the coming days.

Four officials told The Associated Press that the decision followed pressure from the Pentagon and State Department, which had urged the White House to reconsider Iraq's inclusion given its key role in fighting the militant Islamic State (IS) group.

Citizens of six other predominantly Muslim countries Iran, Libya, Somalia, Sudan, Syria and Yemen will remain on the travel ban list, said the officials, who spoke on condition of anonymity because they weren't authorised to discuss the order before it is signed. Those bans are effective for 90 days.

The officials also said the order won't include any explicit exemption for religious minorities in the countries targeted by the travel ban. Critics had accused the administration of adding such language to help Christians get into the United States while excluding Muslims.

The White House did not respond to a request for comment.

Trump signed his original executive order in late January. It sparked immediate confusion, panic and outrage as some travellers were detained in US airports before being sent back overseas and others were barred from boarding flights at foreign airports.

The government initially blocked US green card holders before offering those legal residents special permission to come into the country. It finally decided the order didn't apply to them.

The State Department provisionally revoked roughly 60,000 valid visas in all, before a federal judge in Washington state blocked the government from carrying out the ban. The 9th US Circuit Court of Appeals upheld that decision.

Under the revised order, officials said, all existing visas will be honoured.

In his first address to a joint session of Congress, Trump on Tuesday evening defended his effort. “We will shortly take new steps to keep our nation safe and to keep out those who would do us harm,” he said.

After Trump signed the original order, Iraqi Prime Minister Haider al-Abadi refuted the ban and said he would consider reciprocal measures. Many Iraqi lawmakers urged the government to ban Americans from Iraq in response, despite the potential effects that might have on the anti-IS fight.

Al-Abadi then met with US Defence Secretary Jim Mattis in Baghdad this month and underscored the US-Iraqi partnership. Mattis walked back comments made by Trump, suggesting that Americans could get another chance to seize Iraqi oil as compensation for its military efforts there.

“We're not in Iraq to seize anybody's oil,” Mattis told reporters on that trip.

Al-Abadi also met with US Vice President Pence in Munich earlier this month, where the two publicly discussed ways of strengthening cooperation.

The Trump administration's changes to the immigration order follow a report by intelligence analysts at the Homeland Security Department, which found insufficient evidence that citizens of the seven Muslim-majority countries posed a terror threat to the United States. A draft of the analysis was obtained last week by the AP. -AP