Trump's tweets on Roger Stone under scrutiny

Legal experts say Trump's tweet praising Stone for allegedly saying "I will never testify against Trump," could be part of an obstruction of justice case.
1:47 | 12/04/18

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Transcript for Trump's tweets on Roger Stone under scrutiny
To the white house and new questions this morning for president trump after he publicly attacks his longtime fixer Michael Cohen for cooperating with the Mueller investigation and praises longtime ally Roger stone for standing up to the probe. Want to bring in Cecilia Vega and, Cecilia, she's tweets came in rapid-fire, rapid succession. He called for the judge to give Michael Cohen a full sentence then praised Roger stone for telling me on Sunday I will never testify against trump adding nice to know some people have guts. Legal experts analyzing those tweets say they could be part of an obstruction of justice case. Reporter: Yeah, obstruction or possible witness tampering because they say he's sending two different messages. One clear message to those who cooperate you will be punished and those who refuse to cooperate you will be rewarded. Among those who are now publicly sounding this alarm, George Conway, the conservative lawyer and, of course, kellyanne Conway's husband has become a frequent critic of president trump and tweeted the federal code for witness tampering, another one, the former acting solicitor general under president Obama, he tweeted this is genuinely looking like witness tampering, George. Some are saying this might be something the Democrats take up when at the take control of the house in less than a month. They may do that. Another move from Robert Mueller today. He's going to file a sentencing memo on the president's former national security adviser Michael Flynn. Reporter: He's been cooperating ever since with the Mueller team. A sentencing memo that could detail exactly how much Flynn has been cone rating behind closed doors. And the reason this is significant is because as we've been saying for months now, Mueller's team has been remarkably tight-lipped. We really don't know what they have as it relates to Russia, but this perhaps could pull back the curtains a little bit on their investigation, how much Flynn is cooperating, a lot could change today, George. It's been one of the biggest mysteries, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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