Special counsel Robert Mueller can use President Donald Trump's tweets to establish a "pattern of behavior" in pressing an obstruction case, said Jill Wine-Banks, a former Watergate prosecutor, Thursday on MSNBC.
Mueller is looking into Trump's tweets in which he makes negative statements about Attorney General Jeff Sessions and former FBI Director James Comey, The New York Times reported Thursday.
"It establishes a pattern of behavior, and it shows what his intent really is, so it will be very helpful to see that as part of the evidence against the president," Wine-Banks said.
Trump uses tweets to direct conversations at certain individuals, "and that is the same as if he approached someone in private," Wine-Banks said.
"He's sending a message to all these people: 'Do what I want you to do or else.' He could say that in a one-on-one meeting or he could say it through his Twitter account, both of which amount to obstruction of justice, and he should be held liable," she said.
"I think there's a lot here that is going to help Mueller in prosecuting this case," she added.
Wine-Banks, a frequent Trump critic, also noted a possible obstruction case against Trump in January.
"The pieces of the puzzle are fitting together and they spell obstruction," she told MSNBC's "All In With Chris Hayes" in January.