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.”

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  • 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: