Sen. John CornynJohn CornynThis week: Negotiators hunt for coronavirus deal as August break looms Frustration builds as negotiators struggle to reach COVID-19 deal Chamber of Commerce endorses Ernst for reelection MORE (R-Texas) took to Fox News on Sunday to attack ObamaCare on Medicare Advantage

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"This is sort of a repetition of 'If you like what you have, you can keep it' false promise, because many seniors are finding that the $300 billion that has been cut out of Medicare has been then used to try to fund ObamaCare," Cornyn said Sunday afternoon, two days before his primary.

"Medicare Advantage has been a tremendous success, it's growing because seniors like the innovation, the choice and the range of services that they have have available to them, but this of course threatens this private-sector alternative and will force people into a single-payer option."

Republicans have been hammering Democrats on a planned 2-percent reduction in payments to Medicare Advantage programs, seeking to further erode support for ObamaCare.

Cornyn has been a vocal opponent of the law from the start, and has ramped up his criticism of ObamaCare leading into his primary against Rep. Steve StockmanStephen (Steve) Ernest StockmanInmates break windows, set fires in riot at Kansas prison Wife of imprisoned former congressman cites COVID-19 risk in plea to Trump for husband's freedom Consequential GOP class of 1994 all but disappears MORE (R-Texas). He is expecting to win the race easily.