Philippines president Rodrigo Duterte has ordered the arrest of another senator critical of his administration, revoking a seven-year-old amnesty granted to rebel-turned-senator Antonio Trillanes.

Duterte ordered the military and the police to apprehend Trillanes so that the former navy officer could face trial for leading two failed coups in 2003 and 2007 against the presidency of Gloria Arroyo, an ally of Duterte who was recently installed as speaker of the house of representatives.

Trillanes is the second senator the Duterte administration has ordered arrested. Leila De Lima, a vocal critic of Duterte’s bloody campaign against illegal drugs, has been detained for 18 months over allegations of conspiring to trade illegal drugs.

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Florin Hilbay, De Lima’s lawyer, said there was “a very clear pattern of using the judiciary as instrument to silence critics or perceived enemies of the Duterte administration,” noting that Duterte cannot unilaterally revoke the amnesty granted by a former president.

“It’s purely political and it’s a form of harassment against one of the most vocal critics if not the most vocal critic of the administration. It’s important to note that it was only Senator Trillanes whose certificate of amnesty was nullified,” said Hilbay.

The combative Trillanes, who has accused Duterte of corruption, dismissed the proclamation as a “joke” and used the attention to challenge Duterte to make his bank accounts public.

“We keep going back to this. You don’t have to orchestrate stunts like this ... I don’t have a case but you want me arrested,” Trillanes said on Wednesday as he displayed his amnesty certificate and court orders dismissing his cases.

Trillanes said he would go to the Supreme Court to fight the order.

The proclamation triggered a stand off between the military and the Senate leadership, who refused to allow an arrest to be made in the Senate, where Trillanes had camped overnight.

The Integrated Bar of the Philippines, a national organisation of lawyers, also protested Duterte’s proclamation. “Not even the Supreme Court has the power to modify a judgment that has become final and executory,” said IBP national president Abdiel Dan Fajardo.

“I call on the military and the police to not follow illegal orders. You are not the private armies of Duterte. Do not stain the integrity of the military and police before the Filipino people by acting as pawns to a dictator,” said lawmaker Gary Alejano, also a former navy officer who joined Trillanes in the coups in 2003 and 2007.