President Biden made good on his threat and vetoed a bipartisan bill Monday to add 66 new judges to federal courts that were seen as understaffed.

Biden claimed the bill was “too hurried” in garnering congressional approval — but some observers said he was likely predominantly concerned about the appointments President-elect Donald Trump might be able to make to the posts once in office.

The JUDGES Act would have gradually increased the number of federal judgeships in 13 states through 2035 in the largest US judiciary expansion since 1990.

“The House of Representative’s hurried action fails to resolve key questions in the legislation, especially regarding how the new judgeships are allocated,” Biden, 82, said in a statement on his veto Monday.