What a difference a hyphen makes.  No, they are not calling on the President to resign.  After all, he hasn't tweeted . . . well, you know.  Felicia Sonmez has this post at the WaPo's congressional blog:

A group of 21 Republican House members, including 10 freshmen, is calling on President Obama to re-sign a measure extending key provisions of the Patriot Act, three weeks after he directed that it be signed into law through the use of an autopen.

Of course, since he didn't veto the bill within ten days and Congress hadn't adjourned, it would be law with or without his signature.  See U.S. Const., Article I, § 7.