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WASHINGTON - MAY 31:  The exterior view of the south side of the White House is seen May 31, 2005 in Washington, DC. Vanity Fair Magazine reported that former FBI official W. Mark Felt claimed himself was ?Deep Throat,? the anonymous source who provided information to Washington Post reporter Bob Woodward?s famous Watergate investigation report that led to the former President Richard Nixon's resignation.  (Photo by Alex Wong/Getty Images)
WASHINGTON - MAY 31:  The exterior view of the south side of the White House is seen May 31, 2005 in Washington, DC. Vanity Fair Magazine reported that former FBI official W. Mark Felt claimed himself was ?Deep Throat,? the anonymous source who provided information to Washington Post reporter Bob Woodward?s famous Watergate investigation report that led to the former President Richard Nixon's resignation.  (Photo by Alex Wong/Getty Images)

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    Source: White House researching impeachment

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Source: White House researching impeachment

Sources tell CNN's Evan Perez that lawyers working for the White House have begun researching impeachment procedures.

Source: White House researching impeachment

Sources tell CNN's Evan Perez that lawyers working for the White House have begun researching impeachment procedures.