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A intelligence memo is photographed in Washington, Friday, Feb. 2, 2018.

WASHINGTON (AP) — President Donald Trump and his supporters are using a congressional memo alleging FBI surveillance abuse to raise questions about the origins of a federal investigation into his campaign's ties to Russia.

But the four-page document includes revelations that might complicate the effort to undermine special counsel Robert Mueller's ongoing probe.

The document contends that the FBI relied excessively on an ex-British spy whose opposition research was funded by Democrats. Yet it also says the investigation actually began several months earlier.

The spy admitted to having strong anti-Trump sentiments, but he was also a "longtime FBI source" with a credible track record.

And the warrant to monitor the communications of campaign adviser Carter Page was approved by a judge on four occasions and authorized by Trump's hand-picked deputy attorney general.

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