President Trump has said many times on the campaign trail that he was close to getting a deal with Iran during his first term. And then, something happened.

That something was the killing of three U.S. contractors in Iraq by Iranian proxies and the assault on the U.S. Embassy in Baghdad in late December 2019.

I was working undercover at the time for the U.S. intelligence community running a network of Iranian sub-agents. Some of them had demonstrated access to the Supreme Leader's Intelligence Office in Tehran. That's about as good as it gets, and no one else had it.

My Iranian sub-agents were warning that the assault on the U.S. Embassy in Baghdad was far more serious than it appeared. That led President Trump to airlift 100 U.S. Marines from Kuwait to protect the Baghdad Embassy, and days later, on January 2, 2020, to order the killing of Quds Force commander Qassem Suleimani.

Only later did I learn from a different Iranian sub-source that the Baghdad embassy attack was not just an Iranian operation. It had been motivated -- indeed, solicited -- in large part by a senior advisor to former vice-president Joe Biden, who was seeking ways of destroying Trump's chances of re-election in 2020.

In a series of electronic communications in the late summer of 2019, the senior Biden advisor made a "request" of Iranian foreign minister Mohammad Javad Zarif. This advisor knew Zarif well from his time as a senior official in the Obama administration. After Trump came to the White House, the two men maintained their friendship and met periodically on the sidelines of international fora, where they lamented the demise of a "rational" U.S. policy toward Iran.

On August 11, 2019, the advisor made his initial pitch to Zarif that the Democrats and the Iranian regime shared an interest in maintaining the framework of the 2015 nuclear deal. Since........

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