London (CNN Business) 1. Tech grilling: It's an important day in Washington for Big Tech.

will kick off two days of congressional hearings on Libra, Facebook's new cryptocurrency. Also happening: a House hearing on antitrust issues among online platforms, which will feature representatives from Google GOOG Amazon AMZN Facebook FB Apple AAPL The Senatewill kick off two days of congressional hearings on Libra, Facebook's new cryptocurrency. Also happening: a House hearing on antitrust issues among online platforms, which will feature representatives fromand

Facebook executive David Marcus, who leads the Libra project, said in prepared remarks that Facebook is willing to delay its entrance into the cryptocurrency market to work with regulators. But that may not be enough to quell skepticism about the product.

Treasury Secretary Steven Mnuchin said in a press conference Monday that the US government is worried Libra could be used for illegal activities such as money laundering and human trafficking.

"We will not allow digital asset service providers to operate in the shadows," Mnuchin said.