U.S. President Donald Trump targeted AT&T on social media on Monday, his latest salvo directed at the company’s subsidiary, CNN.

Trump, who’s in London at the start of a state visit, reiterated his complaints about CNN, a Time Warner property now owned by AT&T that the president has frequently blasted for what he sees as negative coverage of him and his administration.

Representatives for AT&T did not immediately respond to a request for comment.

In a pair of tweets on Monday, Trump again complained about CNN’s coverage and asked, “Why doesn’t owner @ATT do something?”

“I believe that if people stopped using or subscribing to @ATT, they would be forced to make big changes at @CNN,” Trump wrote.

Trump is already embroiled in a controversy over the company’s acquisition of Time Warner. The White House is refusing to co-operate with House Democrats who are investigating whether the president sought to intervene in federal regulators’ review of the merger.

The Trump administration’s stance toward the merger ot telco giants T-Mobile and Sprint did not mirror its opposition to the AT&T acquisition, raising speculation Trump’s displeasure toward CNN played a role in the bid to scuttle the deal.

The Justice Department lost an appeal of a federal judge’s approval of AT&T Inc’s $85.4-billion US acquisition of Time Warner, with a spokesperson saying in February there was no plan to try to take the appeal to the Supreme Court.