Page refused to comply with a subpoena on Wednesday that was handed down by the House Judiciary Committee for her to testify before members on Congress. House Speaker Paul Ryan said he is willing to hold her in contempt of Congress if she continues to not cooperate, according to Politico.
Strzok will testify Thursday before a joint hearing of the House Judiciary and House Oversight and Government Reform committees, one week after appearing before the panels behind closed doors.
Republicans did, however, ask 25 questions about Strzok's affair with Lisa Page, a former Federal Bureau of Investigation lawyer who Strzok exchanged inappropriate text messages with about then-candidate Trump.
In a letter to the committees' chairmen, they said an inquiry originally billed as reviewing the investigation into Democrat Hillary Clinton's use of a private email server "has morphed into a partisan, abusive, and improper inquisition of Special Counsel Mueller's investigation of President Trump's campaign and its connections to Russian Federation".
"Lisa Page is a key witness, and it is critical that she come before our committees to answer questions as part of our investigation".
Jeffress said that the Justice Department granted Page's request late Tuesday evening to review the relevant documents before she testifies, and Jeffress is now "working to arrange that process quickly so that we can move forward with her appearance before the Committees".
"All she is asking is to be treated as other witnesses have under the Committees" own rules, ' Jeffress said. "Americans across the country are alarmed at the bias exhibited by top officials at the Justice Department and Federal Bureau of Investigation, and it is imperative Congress conduct vigorous oversight to ensure that never happens again". "We expect them to agree to another date so that Lisa can appear before the committees in the near future", Jeffress said in the statement.
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A handful of House Judiciary and House Oversight committee members gathered an hour after Page's interview was scheduled to start to discuss next steps.
The Judiciary Committee also held a contentious hearing June 28 with FBI Director Christopher Wray and Deputy Attorney General Rod Rosenstein.
Trump tweeted Wednesday: "Ex-FBI LAYER Lisa Page today defied a House of Representatives issued Subpoena to testify before Congress!" He will return to Capitol Hill for the hearing Thursday, the first time he will speak publicly about the messages.
In an interview with the Wall Street Journal earlier this year, Trump said the text between Strzok and Page amounted to "treason" and had exposed an Federal Bureau of Investigation plot against him. Page left it voluntarily shortly after she joined the team and eventually left the Federal Bureau of Investigation.
Strzok had a leading role in the Clinton probe and was removed from the Mueller investigation after the texts were discovered a year ago.
Federal Bureau of Investigation director Christopher Wray and Deputy Attorney General Rod Rosenstein have rejected suggestions of bias against Trump, and have assured Congress that Mueller is conducting his probe appropriately.