Charles Blow writes a regular column for the New York Times. In this one, he excoriates Donald Trump’s serial lies, which never end.

He is not only a liar, he traffics in conspiracy theories.

His “retraction” of the Obama birther claim came after five years of cultivating a following of rabid Obama-haters.

He did not apologize for alleging that Obama was not born in the United States. Instead, he claimed falsely that Hillary Clinton had started the rumor and he was putting it to rest.

This world-class liar had the chutzpah to expect praise for acknowledging that Obama was born in Hawaii, not Kenya.

The President produced his birth certificate years ago, and Trump said it was a fraud. Newspapers in Hawaii reported his birth, but the Trump forces insisted that the conspiracy to hide Obama’s foreign birth began on the day he was born.

This man is a…