House GOP Leader Kevin McCarthy, R-Calif., said Sunday on CBS’ “Face the Nation” that Schiff is the “first-person” who should be brought in, along with his staff.

Last week, House Judiciary Committee Ranking Member Doug Collins, R-Ga., publicly challenged Schiff to come before the judiciary panel.

“Come to the Judiciary Committee,” Collins said after the passage of the impeachment rules resolution. “Be the first witness and take every question asked of you. Starting with your own involvement [with] the whistleblower.”

STATE DEPARTMENT OFFICIAL FLAGGED HUNTER BIDEN’S ‘CONFLICT OF INTEREST’ IN UKRAINE, TESTIMONY SHOWS

Schiff’s office last month said that the whistleblower had reached out to them before filing the complaint in mid-August, giving Democrats advance warning of the accusations that would lead them to launch the inquiry days later. The inspector general’s complaint about Trump’s phone call with Zelensky flagged concerns about efforts to pressure Ukraine to investigate former Vice President Joe Biden and his son Hunter as military aid to the country was being withheld.

A transcript released by the White House shows Trump making that request, but he and his congressional allies deny, and plan to continue to deny, that military aid was clearly linked to the request, or that there was any “quid pro quo.” Some witnesses who have appeared before House committees as part of the impeachment proceedings have challenged that assertion.

Meanwhile, Republicans are also hoping to call the whistleblower to testify, according to the source, who pointed to Schiff’s recent reversal on the issue.

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Schiff in September had promised testimony from the whistleblower “very soon.” But in recent weeks has suggested that testimony is unnecessary.

Meanwhile, Schiff announced Wednesday that his committee would hold the first open hearings of the impeachment inquiry next week, featuring current and former officials with knowledge of the Ukraine controversy.

“On Wednesday, November 13, 2019, we will hear from [U.S. charge d’affaires for Ukraine] William Taylor and [diplomat] George Kent,” Schiff announced. “On Friday, November 15, 2019, we will hear from [former U.S. Ambassador to Ukraine] Marie Yovanovitch.