(CNN) House Intelligence Chairman Adam Schiff on Wednesday threatened to subpoena FBI Director Christopher Wray in order to learn whether there are active counterintelligence investigations related to President Donald Trump and Russia or if the bureau's counterintelligence investigation on that topic has concluded.

Following the conclusion of special counsel Robert Mueller's investigation in March, Schiff has said he wanted to know whether that meant the FBI's counterintelligence investigation into members of Trump's team, which was opened in June 2016, had ended, or f it has instead "mushroomed into a set of other counterintelligence investigations."

On Wednesday, Schiff had yet to get an answer from the FBI and was prepared to soon issue a subpoena if necessary.

"We are determined to get answers, and we are running out of patience. If necessary, we'll subpoena the director and require him to come in and provide those answers under oath," the California Democrat said.

Schiff's comments came after his committee held a hearing on the counterintelligence portion of the Mueller report, which did not establish a criminal conspiracy with the Russian government but did document numerous contacts between Russians and members of Trump's team. The hearing is the first of several that Schiff is planning in order to highlight the substance of the first volume of the Mueller report, while the Judiciary Committee is doing the same for the second volume on obstruction of justice.

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