Sen. John BarrassoJohn Anthony BarrassoGreen groups raise alarms about alleged Pentagon incineration of 'forever chemicals' House passes sweeping bill to target spread of toxic 'forever chemicals' Democrats, greens blast Trump rollback of major environmental law 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 HolderParties to wage census battle with outside groups Welcome to third-world democracy and impeachment Uber settles sexual harassment charges for .4 million 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 SessionsICE subpoenas Denver law enforcement: report Bottom Line DOJ inquiry tied to Clinton, touted by Trump winds down with no tangible results: report MORE (Ala.), Ted CruzRafael (Ted) Edward CruzSeven things to know about the Trump trial All the frontrunners could survive initial Iowa test Republicans face internal brawl over impeachment witnesses MORE (Texas) and Mike LeeMichael (Mike) Shumway LeeSenators are politicians, not jurors — they should act like it Sens. Kaine, Lee: 'We should not be at war with Iran unless Congress authorizes it' Overnight Defense: War powers fight runs into impeachment | Kaine has 51 votes for Iran resolution | Trump plans to divert .2B from Pentagon to border wall 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.”