Washington(CNN) If Donald Trump thought he could end this week with a high note at the G20 summit, Robert Mueller's investigation certainly scuttled those plans.
Hours before Trump boarded his plane to Argentina, a bombshell landed in Trumpworld with the news Michael Cohen had pleaded guilty to lying to Congress about -- and a sign Cohen is talking Trump's business deals with Mueller -- a previously stated "red line" for Trump.
Trump fired back -- from the air -- tweeting that the investigation is an "illegal Joseph McCarthy style Witch Hunt" and should be called off.
He also defended his actions on the campaign trail: "Even if he was right, it doesn't matter, because I was allowed to do whatever I wanted during the campaign."
Meanwhile, the field of would-be challengers to Trump is crystallizing, with more and more Democrats inching closer to announcing their intentions to run.
The Point: Best-laid plans of mice and men (and the Trump administration) often go awry, especially when Robert Mueller is involved.
And here's a recap of this week in 21 headlines:
Monday:
Tuesday:
Wednesday:
Thursday:
Friday: