Benghazi house committee chairman, probing the 2012 attacks on Americans in Libya, has asked former Secretary of State Hillary Rodham Clinton to testify in May.

The order has led to the set up of a high-profile showdown over the use of a private email account server by Clinton in office as secretary of state.

Chairman Trey Gowdy on Thursday mailed a letter to Clinton’s attorney, David Kendall, asking for her cooperation with the panel’s probe into the Benghazi attacks in 2012 and her use of a personal email account as well as server to conduct official business during her tenure.

The South Carolina Republican Rep. has called on the Democratic leader and prominent political figure to testify both the week of May 18 and before June 18.

The first hearing will be mainly concentrated on Clinton’s use of private emails servers during her tenure, while the second hearing will be focused on the September 2012 attacks that claimed lives of four Americans, including the US ambassador to Libya.

The development comes a day after the GOP-led committee hinted that its final report could slip to 2016, just few months before the much-talked presidential election in the United States.

Clinton had recently revealed her mind for contesting the presidential elections in 2016.