Graham: Stephen Miller makes immigration deal impossible 

GOP Sen. Lindsey GrahamLindsey Olin GrahamCIA's report complicates US response to Khashoggi murder Leon Panetta’s nightmare is today's national security crisis The Hill's Morning Report — GOP victorious in Florida while Dems say `Sunbelt strategy’ looks bright for 2020 MORE (S.C.) warned on Sunday that the White House staff is undercutting President TrumpDonald John TrumpPaul Ryan defends Navy admiral after Trump's criticism Trump discussing visit overseas to troops following criticism: report Retired Army General: Trump is ‘acting like an 8th grader’ in attacking ex-Navy SEAL who led bin Laden operation MORE and Congress's ability to get a deal on immigration.

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"Every time we have a proposal it is only yanked back by staff members. As long as Stephen Miller is in charge of negotiating immigration, we're going nowhere," Graham told reporters as he headed into a closed-door negotiation with a bipartisan group of senators.

He added that "the White House staff, I think, is making it very difficult."

Miller, a White House aide, is well known for his conservative views on immigration. He was formerly a staffer for then-Sen. Jeff SessionsJefferson (Jeff) Beauregard SessionsMueller: Whitaker appointment has 'no effect' on ongoing legal challenge Cummings on 'Adam Schitt': 'Mr. President, please do not do that' Senate Dems sue to block Whitaker from serving as attorney general MORE (R-Ala.), who frequently opposed bipartisan immigration deals.

Miller authored the White House's wide-ranging immigration plan, which includes wall funding and cracking down on cities that don't comply with federal immigration law.

Graham said on Sunday that Miller has "been an outlier for years" on the issue of immigration.

The White House fired back at Graham.

"As long as Senator Graham chooses to support legislation that sides with people in this country illegally and unlawfully instead of our own American citizens, we are going nowhere. He’s been an outlier for years," said White House spokesman Hogan Gidley.

Democrats have repeatedly bristled at Miller's involvement in the immigration talks, arguing he isn't a constructive force in the immigration talks.