A key report due Monday could say up to 22 million more people will be without health insurance if a Senate bill is passed.

The Congressional Budget Office will estimate 15 million to 22 million people over a decade will be without health insurance if the Senate bill passes, according to an article in Politico. The so-called “score” from the CBO is due on Monday. The score may make it difficult to muster enough Republicans to get the bill through the upper chamber.