Sen. Ted Cruz, R-Texas, warned that Republicans could face a "bloodbath" in the upcoming midterm elections if they don't follow through on promises with tax reform and healthcare.

"If tax reform crashes and burns, if Obamacare, nothing happens, we could face a bloodbath," Cruz said Friday to a crowd at a Koch brothers-aligned donor summit in New York.

The senator said a lack of legislative accomplishments by the GOP-controlled Congress on these key issues could create a "Watergate-level blowout" in the 2018 midterm elections.

He even took a stab at his own colleagues by snarkily noting that the Senate's confirmation of Supreme Court Justice Neil Gorsuch was "damn near the only thing Senate Republicans have done." He also said it was the "single best" accomplishment achieved by President Trump.

In a similar tone, Vice President Mike Pence addressed the crowd of donors, pleading with them to use their influence over the congressional lawmakers.

"Our entire agenda depends on this Congress stepping forward," Pence said. "Talk to your employees, talk to your suppliers to your fellow business leaders to get them on board."