No oath will be administered and it will all be conduced behind closed doors, presumably with unlimited life-lines permitted to let them consult with their Russian handlers.
From The Hill:
Franken: Trump Jr., Manafort need to testify under oathSen. Al Franken (D-Minn.) said on Sunday that Donald Trump Jr. and former campaign chairman Paul Manafort should testify under oath.During an interview on CNN's "State of the Union," Franken was asked whether it was good enough for the two to testify behind closed doors and not under oath."No, that's not good enough," Franken said. "It should be under oath."Franken said he would like to ask questions about whether they had any other meetings with the Russians.
The comments come after lawmakers announced last week that Trump Jr. and Manafort reached a deal with the Senate Judiciary Committee to avoid appearing at a public hearing....
On the one hand, the last six months have proven beyond debate that every member of this Administration will lie at every opportunity unless they are forced into a corner and given no other choice.
On the other hand, Republicans have a long tradition of going out of their way to spare presidential administrations public embarrassment...
...as long as that administration is Republican: