Since the end of July, President Donald Trump has noticeably tempered his public complaints about the Russia investigation, avoiding any Twitter allusions to a “witch hunt” or threats to fire special counsel Robert Mueller.

That’s partly due to the intervention of White House lawyer Ty Cobb, who since joining the administration two and a half months ago has impressed upon Trump the risks of using such loaded language when it comes to Mueller, according to a White House official and several sources familiar with the president’s legal strategy.