President Trump on Monday used the Justice Department's refusal to defend his controversial immigration order to blast Democrats for slow-walking his attorney general nominee, Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE.

"The Democrats are delaying my cabinet picks for purely political reasons. They have nothing going but to obstruct. Now have an Obama A.G.," he tweeted.

The comment came after Acting Attorney General Sally Yates defied Trump by ordering the Justice Department not to defend Trump’s executive order on immigration and refugees in court.

Yates, a veteran of the Justice Department, was appointed by former President Obama.