State Department employees are using the channel to register objection to the executive action temporarily blocking refugees and visas for citizens of seven mainly Muslim countries.
The president replaced Sally Yates late Monday after she told Justice Department lawyers not to defend his executive order. The top federal prosecutor in suburban Virginia was elevated in her place.
The president concluded that Sally Yates had "betrayed the Department of Justice" by refusing to defend his executive order imposing a temporary ban on certain refugees and visa holders.
Canadians are mourning six people shot to death while praying. Alleged shooter Alexandre Bissonnette had expressed anti-Islam sentiments online. He faces 11 charges of murder and attempted murder.
Immigration and refugee advocates say the details of President Trump's executive order are still in flux. Some travelers have been barred from entering the U.S. Others are receiving exemptions.
Iraq responded with both shock and, in Parliament, a desire for retaliation. In Sudan, the government summoned a U.S. diplomat to protest Friday's executive order.
The White House argues little has changed when it comes to its National Security Council. But the elevation of chief strategist Steve Bannon to the Principals Committee represents a major departure.