Story highlights Former national security adviser Susan Rice is meeting with Congress on Wednesday

Donald Trump Jr.'s meeting with a Senate panel is Thursday

Washington (CNN) Donald Trump Jr. is headed for a staff-level interview with the Senate judiciary committee Thursday and will have to appear publicly or will be subpoenaed, a top senator told CNN.

In addition to Trump Jr., former national security adviser Susan Rice will speak with lawmakers in Congress Wednesday morning, a source with direct knowledge told CNN.

Sen. Dianne Feinstein, the top Democrat on the Senate judiciary committee, told CNN her panel "will have a public hearing with Mr. Trump at an appropriate time."

She did not say when or if Trump Jr. has agreed to the hearing.

"The agreement that we had is that there will be a public hearing and, if they don't come, they'll be subpoenaed," she said.

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