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The guest list for tonight's Obama-GOP dinner

NBC News has learned the following 12 Republican senators will attend tonight's dinner at the White House with President Obama, according to sources familiar with the dinner: 
 
Lamar Alexander (R-Tenn.)
John Boozman  (R-Ark.)
Mike Crapo (R-Idaho)
Pat Roberts (R-Kan.)
Marco Rubio (R-Fla. -- he was invited but may not be able to attend)
Roger Wicker (R-Miss.)
John Thune (R-S.D.)
Mike Enzi (R-Wyo.)
Deb Fischer (R-Neb.)
Orrin Hatch (R-Utah)
Susan Collins (R-Maine)
Johnny Isakson (R-Ga.)

Isakson was the one who organized the guest list.