This might be an opening shot at negotiating for immunity/plea agreements (like Manafort did) as he could pull the plug on Ghouliani. He apparently switched lawyers and is suggesting the option to take the 5th on anything that might be considered incriminating to him specifically.
One issue here being where the hell did Ghoul REALLY get $500,000 from (despite his supposedly being "paid" by Parnas' organization).
Apparently Reuters had the scoop -
Exclusive: Giuliani associate now willing to comply with Trump impeachment inquiry - lawyer
Aram Roston
WASHINGTON (Reuters) - Lev Parnas, an indicted Ukrainian-American businessman who has ties to President Donald Trumps personal lawyer, Rudy Giuliani, is now prepared to comply with requests for records and testimony from congressional impeachment investigators, his lawyer told Reuters on Monday.
Parnas, who helped Giuliani look for dirt on Trumps political rival, former Vice President Joe Biden, is a key figure in the impeachment inquiry that is examining whether Trump abused his office for personal political gain.
His apparent decision to now work with the congressional committees represents a change of heart. Parnas rebuffed a request from three House of Representatives committees last month to provide documents and testimony.
We will honor and not avoid the committees requests to the extent they are legally proper, while scrupulously protecting Mr Parnas privileges including that of the Fifth Amendment, said the lawyer, Joseph Bondy, referring to his clients constitutional right to avoid self-incrimination.
https://www.reuters.com/article/us-usa-trump-impeachment-parnas-exclusiv/exclusive-giuliani-associate-now-willing-to-comply-with-trump-impeachment-inquiry-lawyer-idUSKBN1XE297