The three Republican Senators who voted for the economic stimulus package will meet with a group of moderate-leaning Democrats Tuesday afternoon to firm up their position on the bill before the measure heads into conference committee with the House.

Republican Sens. Susan Collins (Maine), Olympia Snowe (Maine) and Arlen Specter (Pa.) will team up with the moderate Democrats to oppose any effort by the House to put additional spending in the $837 billion Senate-passed package.

House and Senate conferees will meet later this week to work out differences between the two chambers’ stimulus bills.

Senate conferees are Majority Leader Harry Reid (D-Nev.), Appropriations Chairman Daniel Inouye (D-Hawaii) and ranking member Thad Cochran (R-Miss.), and Finance Chairman Max Baucus (D-Montana) and ranking member Chuck Grassley (R-Iowa).

House conferees will be named later today.