President Donald Trumphasrevived his Twitter feud with Republican Sen. Bob Corker as a partial government shutdown continues due to partisan gridlock over immigration and border wall funding.

Trump slammed Corker Sunday afternoon in a pair of Tweets after the Tennessee lawmaker blamed the shutdown on the president in an interview on CNN’s State of the Union. Trump mocked Corker, who is retiring this year, by saying he is stepping down because his poll numbers “tanked” when Trump refused to endorse him. The president also blamed Corker for proposing “the horrible Iran Nuclear Deal” the Trump administration withdrew from earlier this year.

Corker fired back by mocking the President for his immaturity and continuing impulse to lie. “Yes, just like Mexico is paying for the wall,” Corker tweeted, adding the hashtag “#AlertTheDaycareStaff.”

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Corker had previously used that same hashtag to criticize Trump at the beginning of the year, when he blasted the president for running the country like “a reality show.” The Tennessee lawmaker also voiced concern that Trump’s words could potentially spark another World War.

Corker recently stated that if Trump was motivated to shutdown the government because of border security — which includes his request of $5 billion in funding for the border wall — rather than politics, he would have accepted the deal that New York Democratic Sen. Chuck Schumerthe Senate Minority Leader, offered the president in January.

“This is a purposely contrived fight,” Corker said Sunday on CNN. “At the end of the day, no matter who wins our borders are still going to be insecure.” At that time, Schumer had offered $25 billion for border security in return for reauthorizing the Deferred Action for Childhood Arrivals (DACA) program aimed at helping Dreamers, immigrant who came to the U.S. as children. DACA expired in March. Democrats have attempted to meet Trump part of the way on his border wall funds demand, offering $1.3 billion to build a border fence.

The party is seeking to end the government shutdown as soon as possible and avoid it from extending into 2019, so that the 800,000 federal employees affected by it can no longer suffer. The Senate is expected to reconvene on Thursday.