Leith Shubeilat, a fiery critic of the Jordanian government, said on Sunday that he was badly beaten by five unarmed men hours after he condemned his country's peace treaty with Israel.
Shubeilat was hospitalized with cuts and bruises to the face, head and body, but said that he was "conscious and doing well."
In the past, government critics have said they were attacked by plainclothes agents, but the state has denied any involvement.
Shubeilat said Sunday's early morning attack followed a televised interview he gave to an Arab satellite channel, in which he accused the government of corruption and repeated his call for ending the peace treaty with Israel.
Jordan marks the 15th anniversary of its peace treaty with Israel on Monday.