Sen. John BarrassoJohn Anthony BarrassoOvernight Energy: Trump rolls back Obama-era fuel efficiency standards | Controversial Keystone XL construction to proceed | Pressure mounts to close national parks amid pandemic Critics blast Trump mileage rollback, citing environment and health concerns Lobbying world 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 HolderBiden hosts potential VP pick Gretchen Whitmer on podcast The Hill's Campaign Report: Coronavirus forces Democrats to postpone convention Biden associates reach out to Holder about VP search 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 SessionsThe Hill's Morning Report - Presented by Facebook - Guidance on masks is coming The Hill's Campaign Report: Coronavirus forces Democrats to postpone convention Roy Moore to advise Louisiana pastor arrested for allegedly defying ban on large gatherings MORE (Ala.), Ted CruzRafael (Ted) Edward CruzLawmakers announce legislation to fund government purchases of oil Overnight Energy: Oil giants meet with Trump at White House | Interior extends tenure of controversial land management chief | Oil prices tick up on hopes of Russia-Saudi deal Oil giants meet at White House amid talk of buying strategic reserves MORE (Texas) and Mike LeeMichael (Mike) Shumway LeeZoom, grocery delivery, self-isolation: How lawmakers are surviving coronavirus Justice IG pours fuel on looming fight over FISA court Senator Tom Coburn's government oversight legacy 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.”