Rand Paul lashed out at his Republican colleagues for aiming to keep too much of Obamacare in a Senate bill expected to be voted on next week.

Paul wrote in an op-ed in Brietbart News that Republicans campaigned on repealing the entirety of the law, but aren’t living up to those promises. His piece came a day after Senate GOP leadership announced it planned to keep some of Obamacare’s taxes on investments and Medicare to fund its beleaguered bill, which Paul has opposed.