Sen. John BarrassoJohn Anthony BarrassoTo stave off a recession, let's pass a transportation infrastructure bill Overnight Defense: GOP wary of action on Iran | Pence says US 'locked and loaded' to defend allies | Iran's leader rules out talks with US GOP senator: Iran is behind attack on Saudi Arabia MORE (R-Wyo.) said President Obama’s nominee for attorney general will have to tell lawmakers if “executive amnesty” is legal.

Last week, Obama announced that he was nominating Loretta Lynch to replace Eric HolderEric Himpton HolderEric Holder says Trump is subject to prosecution after leaving office Eric Holder: Democrats 'have to understand' that 'borders mean something' Trump lawyers ask judge to toss out Dems' tax return lawsuit MORE as head of the Department of Justice. 

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“She is going to have to specifically come to the Hill, talk about trying to get better relations between the departments and the Hill, and specifically answer questions about executive amnesty. Is it legal? Is it constitutional?” Barrasso said on “Fox News Sunday.”

Senate Democrats could try to approve her nomination in the lame-duck session, but Barrasso warned against it.

“We have not done an attorney general confirmation in a lame-duck since 1906 — and that was in the same party,” Barrasso said. “The last time we’ve done one with a change of party was when James Buchanan was leaving the White House and Abraham Lincoln was coming in. So as I say, what the president does in two months is very consequential for the next two years.”

Other Republicans, such as Sens. Jeff SessionsJefferson (Jeff) Beauregard SessionsTrump reignites court fight with Ninth Circuit pick Democrats press Nadler to hold Lewandowski in contempt Pelosi: Lewandowski should have been held in contempt 'right then and there' MORE (Ala.), Ted CruzRafael (Ted) Edward CruzState Department's top arms control official leaving Sanders NASA plan is definitely Earth first Trump judicial picks face rare GOP opposition MORE (Texas) and Mike LeeMichael (Mike) Shumway LeeZuckerberg woos Washington critics during visit Zuckerberg to meet with lawmakers to discuss 'future internet regulation' Hillicon Valley: Election security looms over funding talks | Antitrust enforcers in turf war | Facebook details new oversight board | Apple fights EU tax bill MORE (Utah) have also said the nominee should rebuke Obama’s planned executive order on immigration policy.

The administration had announced that after the midterm election it would issue an executive order allowing nearly 5 million immigrants to stay in the United States on worker visas — many of the immigrants have U.S. children. But Republicans have blasted the idea, calling it “executive amnesty.”