The news organizations reportedly notified administration officials of their plans, escalating a dispute over press access and the rules governing coverage of the presidency.
The outlets contend that restricting their access raises concerns about equal treatment of the press and the public’s ability to receive independent reporting.
The administration has not publicly detailed its justification for excluding the organizations or indicated how it will respond to the threatened lawsuit.
The dispute comes amid broader tensions between the Trump administration and major news outlets, including disagreements over press credentials, access and coverage.
Any legal action could test the limits of executive authority over White House media access and clarify whether officials may selectively restrict organizations from presidential events. Further details, including the timing and legal basis of a potential filing, were not immediately available.