Kevin McCarthy’s explosive “joke” points toward a darker questions: How long have leading Republicans known about Donald Trump’s Russia problem?

As happens almost every day, Wednesday featured a late-breaking bombshell Trump story. This one was the welcome news that Deputy Attorney General Rod Rosenstein had done his job and appointed a special counsel to take over the Russia investigation. He made a good choice by picking Robert Mueller, the former U.S. attorney and FBI director for 12 years under both George W. Bush and Barack Obama.

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