Topeka ? Kansas U.S. Sen. Pat Roberts is getting a somewhat reluctant endorsement from his former Republican primary challenger, Milton Wolf.

In a message posted Thursday on his campaign Facebook page, Wolf urges his supporters to set aside their differences with Roberts and vote for the Republican incumbent in next Tuesday’s election.

Roberts is in a close race with independent candidate Greg Orman.

Wolf criticized Roberts as out-of-touch during the primary. But his Facebook message says Roberts’ election could be the deciding factor on whether Republicans take control of the Senate, which he says could put other “solid constitutional conservatives” in positions of power.

If Roberts is re-elected, Wolf writes that he will “hold his feet to the fire” and continue to “see to it that Kansans have alternatives to failed leadership.”