Rep. Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.) has a question about Republicans' plan to repeal and replace ObamaCare: Will Mexico cover the medical costs of Americans "hit over head with a big sack of drugs" tossed over President Trump's proposed border wall?

"If an American is hit over head with a big sack of drugs flying over the wall, would it be covered by Trumpcare, or would Mexico pay for it?" Schiff wrote on Twitter Saturday.

If an American is hit over head with a big sack of drugs flying over the wall, would it be covered by Trumpcare, or would Mexico pay for it? pic.twitter.com/mzKQx8Rroh — Adam Schiff (@RepAdamSchiff) July 15, 2017

The question is an apparent jab at Trump's remarks aboard Air Force One this week, in which he floated the notion that drug traffickers could harm Americans by throwing "large sacks of drugs" over the border wall.

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"As horrible as it sounds, when they throw the large sacks of drugs over, and if you have people on the other side of the wall, you don't see them – they hit you on the head with 60 pounds of stuff? It's over," Trump said. "As crazy as that sounds, you need transparency through that wall."

As a presidential candidate, Trump campaigned on the promise to build a massive wall along the U.S.-Mexico border – a project he says Mexico will pay for.

Schiff's swipe at Trump and his administration's efforts to overhaul the country's healthcare system came as Senate Republican leaders eye a final vote on their revised healthcare bill next week.

The bill, however, cannot afford more than two Republican defections if GOP leaders hope to pass it, and already two GOP members have said they will not vote for it. Senate Democrats are unanimously opposed to the measure.