Updated

House Minority Leader John Boehner, in a shockingly blunt admission Tuesday night to a small group of Republicans, called the immigration bill praised by congressional leaders and the White House a 'piece of s---," FOX News confirmed Wednesday.

"I promised the president today that I wouldn't say anything bad about ... this piece of s--- bill," Boehner said, according to a report in the National Journal's Hotline blog.

Boehner spoke to the private reception for the Republican Rapid Responders on Capitol Hill Tuesday night. FOX News confirmed the Ohio lawmaker's comments.

Boehner released a statement earlier Tuesday saying he had "significant concerns" about provisions in the Senate proposal that would "reward illegal immigrants who have consistently broken our laws."

The Senate continues debate on the bill Wednesday with both sides of the aisle tearing it apart through amendments. Congressional leaders predict they will finish the legislation in two weeks.

Boehner's office did not immediately return a phone call for further comment.

Click here to read the Hotline blog.