In a rare step, the California Supreme Court has blocked Gov. Jerry Brown’s attempt to issue a pardon to a 37-year-old Cambodian refugee who killed a woman when he was 14 years old.

The court gave no reason for the rejection, but earlier noted it only had the authority to do so in the case of an “abuse of power.” Brown’s pardon would have effectively stopped Borey Ai’s deportation to Cambodia, a nation where his mother was born but he has never seen.

The governor in the last 10 months has pardoned seven ex-convicts who otherwise faced the threat of deportation to Cambodia, drawing the ire of President Donald Trump, whose administration has stepped up efforts to deport immigrants with criminal convictions.

It takes at least four votes of the seven justices to block pardons. The unsigned ruling Wednesday didn’t say how many justices voted to block the pardon. The governor is required to obtain the court’s approval for pardons and sentence commutations for twice-convicted felons.

Appellate lawyer David Ettinger said it appears the last time the court rejected a governor’s pardon occurred in 1930.

A spokesman for the governor, Brian Ferguson, declined comment.

Ai was charged as an adult and convicted in Santa Clara County 1997 of second-degree murder and also of a separate robbery. He was sentenced to 25-years-to-life in prison.