Speaking to reporters at the White House during an meeting with lawmakers on cancer, Biden said his team “will make judgments” regarding how or if to respond after that determination is made.
No one claimed responsibility for the rocket attack, the first since the U.S. struck Iran-aligned militia targets along the Iraq-Syria border last week.
A U.S. contractor died from a cardiac episode after at least 10 rockets slammed into the base.
The president also said he thinks the decisions by the governors of Texas and Mississippi to ease COVID restrictions, including eliminating mask mandates, “is a big mistake.”
Biden said the nation is “on the cusp of being able to fundamentally change the nature of this disease” because of his administration’s vaccine progress, and he said, “the last thing we need is Neanderthal thinking.”