Analysis of information sources in references of the Wikipedia article "Howard Baker" in English language version.
When the Iran-Contra scandal and the Tower Commission Report were making life miserable for Ronald Reagan, former Sen. Howard H. Baker Jr., 61, came to the President's rescue. A loyal but moderate Republican, he agreed to return to government as Reagan's new chief of staff, replacing the controversial Donald Reagan.
...the real heroes of Watergate were Republicans... he told the story of U.S. Sen. Howard Baker who was loyal to the White House at the beginning of the investigation. Baker promised Nixon, "I'm your friend. I'm going to see that your interests are protected." Later, though, he became famous for asking aloud, "What did the president know and when did he know it?"