Former FBI Director Andrew McCabe reportedly opened an investigation of President Trump for obstruction of justice after the president fired James Comey, the agency’s former director.

The FBI had previously considered looking into obstruction of justice but did not act on it until after Mr. Comey was fired by the president, CNN reported Friday.

It was allegedly among the discussions on how to counter Mr. Trump that Deputy Attorney General Rod Rosenstein reportedly suggested wearing a wire or moving on the 25th Amendment. While those ideas weren’t acted on, Mr. McCabe, who was the acting FBI director following the Comey firing, decided to open the probe.

This investigation ultimately became a key element of the Mueller probe, which has plagued Mr. Trump’s presidency.

“It’s shocking that the FBI would open up an obstruction case for the president exercising his authority under Article II,” Trump lawyer Rudolph Giuliani told CNN.

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