Susan Rice, the former national security adviser to Barack Obama, has opted out of appearing before a Senate subcommittee investigating Russia's interference in the 2016 election, according to a CNN report on Wednesday.
The request was extended by Republican Senator Lindsey Graham.
A letter sent on Rice's behalf by her lawyer, Kathryn Ruemmle, reads, in part, "Senator Whitehouse has informed us by letter that he did not agree to Chairman Graham's invitation to Ambassador Rice, a significant departure from the bipartisan invitations extended to other witnesses. Under these circumstances, Ambassador Rice respectfully declines Senator Graham's invitation to testify."
RELATED: Former Obama adviser Susan Rice
Former Obama adviser Susan Rice
Former Obama adviser Susan Rice
National Security Advisor Susan Rice, gets ready for Prime Minister Matteo Renzi of Italy, and U.S. President Barack Obama's joint press conference in the Rose Garden of the White House on October 18, 2016 in Washington, DC, USA. (Photo by Cheriss May/NurPhoto via Getty Images)
U.S. National Security Advisor Susan Rice heads to her seat before a ceremony awarding the Presidential Medal of Freedom to various receipients in the East Room of the White House in Washington, U.S., November 22, 2016. REUTERS/Carlos Barria
WASHINGTON, DC - NOVEMBER 22: Henry Louis Gates, Jr., Alphonse Fletcher University Professor and Director of the Hutchins Center for African and African American Research at Harvard University, and White House National Security Advisor Susan Rice visit during the Presidential Medal of Freedom ceremony in the East Room of the White House November 22, 2016 in Washington, DC. U.S. President Barack Obama presented the medal to 19 living and two posthumous pioneers in science, sports, public service, human rights, politics and the arts. (Photo by Chip Somodevilla/Getty Images)
US Secretary of the Treasury Jack Lew (L) and National Security Advisor Susan Rice listen as Greek and US President talk before a meeting at the Presidential Mansion on November 15, 2016 in Athens. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
National Security Advisor Susan Rice speaks with AFP during an exclusive interview in her office at the White House in Washington, DC, November 14, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
White House National Security Adviser Susan Rice (R) and former Defense Intelligence Agency Director retired Army Lt. Gen. Michael Flynn, incoming White House national security adviser, shake hands at the U.S. Institute of Peace "2017 Passing the Baton" conference in Washington, U.S., January 10, 2017. REUTERS/Yuri Gripas
U.S. National Security Adviser Susan Rice (L) speaks to the media next to White House Press Secretary Josh Earnest in the Brady Press Briefing Room inside the White House, in Washington, September 19, 2014. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS MILITARY)
National Security Adviser Susan Rice (R) and Press Secretary Jay Carney walk away from Marine One on the South Lawn at the White House in Washington, May 28, 2014. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS)
U.S. President Barack Obama speaks as he meets in New York with representatives (not pictured) of the five Arab nations that contributed in air strikes against Islamic State targets in Syria, September 23, 2014. Representatives from Iraq were also at the meeting. Sitting next to Obama are U.S. Secretary of State John Kerry (2nd L), U.S. Ambassador to the United Nations Samantha Power (L) and U.S. National Security Adviser Susan Rice (R). The United States and its Arab allies bombed Syria for the first time on Tuesday, killing scores of Islamic State fighters and members of a separate al Qaeda-linked group, opening a new front against militants by joining Syria's three-year-old civil war. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS CONFLICT MILITARY CIVIL UNREST)
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It goes on to note, "...as Ambassador Rice has stated publicly, she supports and is committed to assisting the bipartisan Congressional inquiries into Russian interference in the 2016 election, given the utmost importance of this matter to our national security."
Politico notes that Rice became a person of interest in the Russia investigation "following reports last month that, as national security adviser, she requested the names of President Donald Trump's transition aides who were referenced in intelligence reports after the election."
President Trump's response to Rice's decision to forego the hearing was swift.
On Thursday morning, he tweeted, "Susan Rice, the former National Security Advisor to President Obama, is refusing to testify before a Senate Subcommittee next week on allegations of unmasking Trump transition officials. Not good!"