Democratic Senator Majority Leader Harry Reid has exempted his staffers from needing to buy insurance through Obamacare.
The Nevada lawmaker, who has been one of the strongest supporters of the new health care law, is drawing sharp criticism from Republicans over the decision.
"Sen. Reid's decision to exempt his staff from Obamacare exchanges is the clearest example yet of Obamacare's failures and Washington hypocrisy," Sen. Ted Cruz, R-Texas, said in a statement.
"His staff worked to pass it and continue to promote it; now they don't want to be part of it because it's a disaster," he added.
A spokesman for Reid said they are just following the law.
Meanwhile, GOP House Speaker John Boehner and House Democratic Leader Nancy Pelosi have both directed their staffs to join the exchange.