Woodward reported in the book fear that Dowd didn't understand where Mueller was coming from in his insistence to depose Trump, and that Dowd considered that Mueller had something that Trump's defense team wasn't aware of. Both the house and the senate investigations have taken back seats to Mueller's investigation, and we know that several (Rep. Spier has said there are 2 more, with Trump Jr. being one of them) people close to Trump have lied to congress in powder puff interviews, so of course there are going to be things that Mueller knows that Burr wouldn't know, so it's still too early to make too much of what Burr is saying at this point.
Dowd was on a podcast today and used "guess" instead of "lie" euphemistically to paraphrase what Woodward reported in his book about why Trump couldn't sit through a deposition without lying because Trump is a "fucking liar." It is beyond ridiculous, unless Trump truly is mentally handicapped, that he would be unable to keep his composure and answer "I don't recall" to questions he supposedly doesn't know the answers to. I am sure Dowd has considered that there are things that Trump has lied to him about though, but just doesn't want to admit that about someone who was paying him a $100K a month retainer, and he couldn't condone Trump being put in a vulnerable position.
Trump and his goons have lied about anything and everything Russia in the media, and to congress, and several high profile people from his campaign are going to spend time in prison. We know that Manafort, the head of Trump’s campaign, was offering secret polling data, for a US election, to a Kremlin linked Ukrainian spy with the point of facilitating the Kremlin's intervention into the US presidential election, to benefit Donal J. Trump, in exchange for helping Russian interests vis-a-vis Ukraine (which we saw him do). And, we know that Manafort, along with Trump Jr. and Kushner, met with Natalia V. Veselnitskaya, who has now clearly been exposed as an agent of the Kremlin (and therefore was working for the Kremlin at the time of the meeting) and discussed a quid pro quo deal to help Trump win the election in exchange for the Trumps undoing the Magnitsky act. And we have had Trump Jr. lying his ass off about all of it to the media (and most likely to congress as well), we have Trump Sr. crafting lies for Trump Jr. to try to cover up those lies.
Roger Stone was just indicted for lying to congress in his testimony surrounding Wikileaks, and we know that Wikileaks, according to Pompeo, is a "nonstate hostile intelligence service often abetted by state actors like Russia,” and that “Russian military intelligence, the G.R.U., had used WikiLeaks to release data of U.S. victims that the G.R.U. had obtained through cyberoperations against the Democratic National Committee”, and that Assange does not "enjoy First Amendment protections."
Beyond those three pathways to Russian intelligence, there are the other unexplained issues:
1. Why was Trump lying about not trying to do business in Russia at that time if it was just another innocent business deal (and what an odd coincidence that the deal was being discussed while Trump was running for president with such an oddly pro Russian and pro Putin platform)?
2. Why was Cohen lying about to congress about that deal?
3. Why has Trump taken Putin's side over his intel chiefs many times when it comes to Russia interfering in the 2016 election, interference that was occurring while the Trump org was trying to build that tower, and while they were trying to bribe Putin with a $50 million penthouse (and was subsequently lied about until recently).
4. Why would Trump say something so moronic that he thought Putin's idea of bringing Russian Intelligence into the US's investigation into Russian election meddling was a great offer?
5. And overall, why does Trump continue to kowtow to the leader of a country that has only the GDP of South Korea (or New York State) when he has shit all over everyone else in the world, including South Korea who is our most important ally on the North Korea nuclear front? Why is his relationship so different with Putin?