President Biden said Friday that former president Donald Trump should not have access to classified information in the form of the briefings usually given to ex-presidents, citing Trump’s “erratic behavior” and the risk that he might recklessly reveal sensitive information.

Biden stopped short of announcing that he had officially decided to prevent his predecessor from receiving the briefings, which are traditionally given before former presidents travel abroad, particularly in an official capacity. But Biden has the unilateral authority to deny intelligence access to anyone he chooses, and his remarks amounted to a statement that Trump — who for four years controlled the entire U.S. security apparatus — was himself a security risk.

The Washington Post reported in May 2017, for example, that Trump had revealed highly classified information to the Russian foreign minister and the Russian ambassador to the United States during a White House meeting, jeopardizing a valuable source of intelligence on the Islamic State.