This has been expected for some time here. Associated Press was banned from the White House because of the "Gulf of Mexico" issue. In Reuters case it's tied to extensive investigative stories they reported about Elon Musk at all of his companies prior to going to the White House.
The White House on Wednesday denied reporters from Reuters and other news organizations access to President Donald Trump’s first cabinet meeting in keeping with the administration’s new policy regarding media coverage.
The White House denied access to an Associated Press photographer and three reporters from Reuters, HuffPost and Der Tagesspiegel, a German newspaper.
TV crews from ABC and Newsmax, along with correspondents from Axios, the Blaze, Bloomberg News and NPR were permitted to cover the event.
On Tuesday, the Trump administration announced the White House would determine which media outlets would cover the president in smaller spaces such as the Oval Office.
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Trump Trashes Totally Normal Spending ... That His Administration Authorized
Donald Trump trashed a government contract with Reuters that his own administration authorized, describing the outlet as "radical left."
Trump demands ‘Radical Left Reuters’ return a $9 million government contract. He’s the one who paid it out in the first place
After Elon Musk first pushed a misleading claim about Reuters, the president raged about the global news agency returning a contract that was awarded under his first administration
Interestingly Trump accuses Reuters of being "Radical Left" while discussing about the contract Thompson Reuters had with the DOD over databases that was approved by congress during the first time Trump was President. Note Thompson Reuters is a different division from Reuters News agency.