President Donald Trump said Thursday he was moving to suspend the security clearances of attorneys at a prominent law firm linked to Democratic-funded opposition research during the 2016 presidential campaign into ties between the Republican candidate and Russia.

The order against the firm, which did work for Democrats during the 2016 campaign, represents an escalation of efforts to punish groups the president sees as aiding his enemies.

U.S. President Donald Trump on Thursday said he would strip Perkins Coie employees of federal security clearances over the law firm's diversity practices and political activities, as he launched a probe into other legal firms.