Republican senators are "nervous" departed-Sen. Arlen Specter (D-Pa.) may switch his stance on the Employee Free Choice Act (EFCA) and back the labor legislation.

"We're very nervous about some of the public statements he's made," Ensign told a group of conservative bloggers Wednesday, as reported by the American Spectator.

Specter had announced that he wouldn't back EFCA (or "card check") before having switched parties last month to pursue reelection as a Democrat. Since then, members of the business and organized labor community have both heavily lobbied Specter to either deny or attain the critical votes to overcome a filibuster of the bill.

"We hope he honors not just the leter of his pledge, but the intent of the pledge," Ensign told the bloggers.