Dick Nixon: I Am not a Crook. Elon Musk: I Am not Taking Drugs. Bill Clinton: I Did not Have...

 ...sexual intercourse with that woman!

Oliver North (1980s) lied in his congressional testimony by saying that he never diverted funds from Iranian arms sales to support the Nicaraguan Contras. In fact, his boss Ronald Reagan's own diaries, released years later, showed that Reagan was selling weapons to the terrorist regime of Iran in exchange for Syria's release of US hostage held by the Hezbollah terror organization in Syrian-occupied Lebanon. The Israeli government was delivering the weapons to Iran by flying them from Tel Aviv to Tehran. The money from the arms sales were used to fund the illegal terrorist organization of the Nicaraguan Contras. Reagan was a Republican.

British Prime Minister Tony Blair lied to his Parliament, just as W. Bush and Colin Powell lied to Congress and to the UN,  by saying that Iraq possessed weapons of mass destruction that could be deployed within 45 minutes. The subsequent invasion of Iraq by Blair and George W Bush found no such weapons. Bush was a Republican.

Dick Nixon's watergate scandal: He vehemently denied and declared "I am not a crook". He eventually resigned his presidency to avoid being impeached and thrown out of office. Nixon was a Republican.

No point saying anything about Trump's lies, falsehoods and misleading statements. A tally of them by the Washington Post came up with 30,573 documented false or misleading claims during his first presidential term, an average of 21 per day. I have not yet seen a tally of his lies since he began his wretched second term this past January. Trump is a Republican.