Bernie Sanders Matt Rourke/AP Sen. Bernie Sanders on Monday tweeted an image of a blank piece of paper on Monday, joking it was the schedule for hearings on the GOP healthcare bill.

"BREAKING: Senate Republicans just released the schedule of hearings, committee markups and public testimony for their health care bill," Sanders' account tweeted.

Senate Republicans have been writing their own version of the House GOP's American Health Care Act aimed at repealing and replacing Obamacare. But they have so far not held any hearings on the bill, nor have they released any legislative text.

According to reports, Senate GOP leaders are not planning to release their bill until it goes to committee for a vote.

Sanders also retweeted Greg Sargent, a liberal blogger at The Washington Post, who joked that the blank sheet also contained the yet-to-be-released bill text.

Sanders follows Sen. Claire McCaskill, who asked Senate Finance Committee Chair Orrin Hatch if Republicans were planning to have any hearings on their bill during a hearing last week with Health and Human Services Secretary Tom Price.

Here's the tweet: