The head of the US House Intelligence Committee is calling on Joe Biden to declassify information about “a serious national security threat”.
Republican congressman Mike Turner gave no details about the nature of the threat, but a senior aide said that they understood the threat relates to a space-deployed Russian anti-satellite weapon that may or may not have already been deployed.
Such a weapon could pose a major danger to American satellites that transmit billions of bytes of data on an hourly basis.
The Biden administration declined to specifically address the alleged threat.
The aide, speaking on condition of anonymity due to the sensitivity of the matter, said it was not yet clear if the Russian weapon has nuclear capability, but said that is the fear.
However, several leading politicians, including House Speaker Mike Johnson, warned against Americans being overly alarmed.
Information is ‘significant’ but ‘not a cause for panic’
Mr Turner sent an email to members of Congress on Wednesday saying his committee had “identified an urgent matter with regard to a destabilising foreign military capability” that should be known to all congressional policymakers.
He encouraged them to come to a secure area to review the intelligence.
Mr Turner has been a voice for stronger US national security, putting him at odds with some Republican colleagues who favour a more isolationist approach.
He has called for the renewal of a key US government surveillance tool while some fellow Republicans and liberal Democrats have raised privacy objections.
And he supports continuing US military aid for Ukraine in its war against Russia at a time when the funding remains uncertain because of opposition in the Republican-led House.
Mr Johnson said he was not at liberty to disclose the classified information.
“But we just want to assure everyone steady hands are at the wheel. We’re working on it and there’s no need for alarm,” he told reporters.
Democratic congressman Jim Himes, the ranking member of the Intelligence Committee, said in a statement that the classified information is “significant” but “not a cause for panic.”
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The Senate Intelligence Committee said it has been tracking the issue.
“We continue to take this matter seriously and are discussing an appropriate response with the administration,” Senator Mark Warner, the Democratic committee chairman, and Senator Marco Rubio, the Republican vice chairman, said in a statement.
“In the meantime, we must be cautious about potentially disclosing sources and methods that may be key to preserving a range of options for US action.”
National security adviser Jake Sullivan told reporters at the White House that he already had been due to brief Mr Turner and other senior congressional leaders on Thursday.
Mr Sullivan did not disclose the topic or provide any other details related to Mr Turner’s statement.
“I’m focused on going to see him, sit with him as well as the other House members of the Gang of Eight, tomorrow,” he said.
“And I’m not in a position to say anything further from this podium at this time.”