It seems to depend on which newspaper you read.
The Washington Post has a story with the headline "McConnell gives bipartisan immigration reform a boost." According to the Post:
Senate Minority Leader Mitch McConnell (R-Ky.) said Monday that fixing the nation’s broken immigration system and improving border security are “crucial objective that our nation needs to address,” offering a key boost to a bipartisan effort to reform immigration laws.
McConnell stopped short of fully endorsing the new Senate framework. But he praised the group for their “hard work.”
The AP spun things a little differently:
But the senators quickly encountered a cool reaction from other lawmakers, including Senate Republican Leader Mitch McConnell, who said immigration legislation is too important to be written in a back room.