Judge Andrew Napolitano said today that Donald Trump Jr., Paul Manafort and Jared Kushner should "say nothing" if they testify under oath before Congress. 

Napolitano said all three must be careful to avoid incriminating themselves, since they're "in the crosshairs" of special counsel Robert Mueller's investigation. 

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"[As a lawyer], you don't want them denying something before they're accused," he said, adding their lawyers do not know what evidence Mueller might have. 

He also stressed that the hearings should be public because the public has a right to know what's happening. 

"I am offended when these hearings take place in secret. Because democracy dies in darkness. This is the power of the government forcing people to testify. We should know what the testimony is, we should know what the Congress knows and what the Congress is going to do about it," he said. 

Trump's oldest son and Manafort, his former campaign manager, are scheduled to testify before the Senate Judiciary Committee on July 26. Kushner, Trump's son-in-law and a top White House adviser, is set to appear behind closed doors with the Senate Intelligence Committee on Monday, July 24.

Watch the "Outnumbered" discussion above.

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