Analysis: Why 1 simple lie by Cohen could invalidate his entire testimony

In order for Michael Cohen to be seen as a credible and reliable source on Donald Trump's business dealings, political activities and character -- both in and out of the White House -- the President's former fixer must be viewed as a changed man, someone who lied, yes, but has now seen the light and spent his House hearing on Tuesday telling the truth and nothing but the truth about his former boss.

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