President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's chief economic adviser, Larry Kudlow, offered Facebook founder and CEO Mark Zuckerberg Mark Elliot Zuckerberg2.5 million US users register to vote using Facebook, Instagram, Messenger Hillicon Valley: Trump's ban on TikTok, WeChat in spotlight | NASA targeted by foreign hackers | Instagram accused of spying in lawsuit The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE fashion advice ahead of his upcoming Capitol Hill testimony this week, saying he should stop wearing "hoodies and dungarees."

"Is he going to behave like an adult? As a major corporate leader? Or give me this phony bologna, what is it, hoodies and dungarees? What does that kind of signal sell?" Kudlow told reporters at the White House on Monday.

"I think I could help him clean up his act," he continued.

Zuckerberg donned a suit and tie to meet with lawmakers on Capitol Hill ahead of his testimony on Tuesday.

Zuckerberg Monday meetings with senate committees leadership are meant to set groundwork for hearing beginning tomorrow afternoon. pic.twitter.com/l9BxJUZl26 — CeciliaKang (@ceciliakang) April 9, 2018

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Zuckerberg will testify before the Senate Commerce and Judiciary committees about Facebook's use of user data, following revelations that political contractor Cambridge Analytica used Facebook to obtain information on 87 million Americans without their consent.

He will also testify on Wednesday before the House Energy and Commerce Committee.

Zuckerberg is slated to apologize to Congress, according to the prepared testimony released by the House panel.