“I am responsible for ensuring that the positions we take in court remain consistent with this institution's solemn obligation to always seek justice and stand for what is right,” Yates wrote in a letter announcing her position. “At present, I am not convinced that the defense of the Executive Order is consistent with these responsibilities nor am I convinced that the Executive Order is lawful.”

Trump responded Monday by accusing Democrats of delaying approval of his Cabinet nominees for political reasons. “Now have an Obama A.G.,” the president wrote on Twitter.

Yates' abrupt decision deepened the discord and dissent surrounding Trump's order, which temporarily halted the entire US refugee program and banned all entries from seven Muslim-majority nations for 90 days. As protests erupted at airports over the weekend and confusion disrupted travel around the globe, some of Trump's top advisers and fellow Republicans privately noted they were not consulted about the policy.

At least three top national security officials _ Defense Secretary Jim Mattis, Homeland Security Secretary John Kelly and Rex Tillerson, who is awaiting confirmation to lead the State Department _ have told associates they were not aware of details of directive until around the time Trump signed it. Leading intelligence officials were also left largely in the dark, according to US officials.

Tennessee Sen. Bob Corker, the top Republican on the Senate Foreign Relations committee, said that despite White House assurances that congressional leaders were consulted, he learned about the order in the media.

Other parts of Trump's administration were voicing dissent Monday. A large group of American diplomats circulated a memo voicing their opposition to the order, which temporarily halted the entire US refugee program and banned all entries from seven Muslim-majority nations for 90 days. In a startlingly combative response, White House spokesman Sean Spicer challenged those opposed to the measure to resign.

“They should either get with the program or they can go,” Spicer said.

The blowback underscored Trump's tenuous relationship with his own national security advisers, many of whom he met for the first time during the transition, as well as with the government bureaucracy he now leads. While Trump outlined his plan for temporarily halting entry to the US from countries with terror ties during the campaign, the confusing way in which it finally was crafted stunned some who have joined his team.

Mattis, who stood next to Trump during Friday's signing ceremony, is said to be particularly incensed. A senior US official said Mattis, along with Joint Chiefs Chairman Joseph Dunford, was aware of the general concept of Trump's order but not the details. Tillerson has told the president's political advisers that he was baffled over not being consulted on the substance of the order.

US officials and others with knowledge of the Cabinet's thinking insisted on anonymity in order to disclose the officials' private views.

Trump's order pauses America's entire refugee program for four months and indefinitely bans all those from war-ravaged Syria. Federal judges in New York and several other states issued orders that temporarily block the government from deporting people with valid visas who arrived after Trump's travel ban took effect.

The president has privately acknowledged flaws in the rollout, according to a person with knowledge of his thinking. But he's also blamed the media _ his frequent target _ for what he believes are reports exaggerating the dissent and the number of people actually affected.

Trump has also said he believes the voters who carried him to victory support the plan as a necessary step to safeguard the nation. And he's dismissed objectors as attention-seeking rabble-rousers and grandstanding politicians.

After a chaotic weekend during which some US legal permanent residents were detained at airports, some agencies were moving swiftly to try to clean up after the White House.

Homeland Security, the agency tasked with implementing much of the refugee ban, clarified that customs and border agents should allow legal residents to enter the country. The Pentagon was trying to exempt Iraqis who worked alongside the US and coalition forces from the 90-day ban on entry from the predominantly Muslim countries.

“There are a number of people in Iraq who have worked for us in a partnership role, whether fighting alongside us or working as translators, often doing so at great peril to themselves,” said Navy Capt. Jeff Davis, a Pentagon spokesman.

Policies with such broad reach are typically vetted by affected agencies and subject to review by multiple agencies. It's a process that can be frustratingly slow but is aimed at avoiding unintended consequences.

On Capitol Hill, lawmakers in Trump's party sought to distance themselves from the wide-ranging order.

While Spicer said “appropriate committees and leadership offices” on Capitol Hill were consulted, GOP lawmakers said their offices had no hand in drafting the order and no briefings from the White House on how it would work.

“I think they know that it could have been done in a better way,” Corker said of the White House.

Some Trump supporters defended the president, saying his actions should not have come as a surprise given his positions during the campaign.

“Nothing he did over the weekend was new,” said Newt Gingrich, the former House speaker and an informal adviser. He conceded that coordination could have been better, but he said Trump's vow to quickly bring change to Washington will sometimes mean he needs to prioritize fast action over broad consultation.

“If you're the reformer, you need the momentum,” Gingrich said. (AP)