Conservative advocacy groups on Friday lined up behind new legislation in the House to defund ObamaCare.

The Club For Growth, FreedomWorks, ForAmerica and the Tea Party Patriots all endorsed a bill from Rep. Tom Graves (R-Ga.) that would tie a one-year delay in the healthcare law to funding for the government.

“Republicans, Democrats and Independents are united in opposition to this horrible piece of legislation and momentum is building to stop it,” Club for Growth President Chris Chocola said in a statement.

The endorsements could embolden conservatives who are pushing the risky legislative strategy of using the threat of a government shutdown to stop President Obama’s healthcare law from taking effect.