Maybe just a little histrionic? 'betray his colleagues'?? By going to a dinner? And bringing back useful info?
Was there something missing in the story? Is he planning on telling the dinner table about some other Senators little foibles, such as getting staff to do non-senate work? Because that's no secret any more.
Trudeau was smart to cut off the old Liberal Senators for  his party. CPC could have done the same if they had been smart enough.