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WASHINGTON The top Democrat on the Senate Intelligence Committee said there was no proof so far of collusion between Russia and Donald Trumps campaign, as Congress geared up for a week of high drama highlighted by the testimony of former Federal Bureau of Investigation Director James Comey.

Listen, theres a lot of smoke. We have no smoking gun at this point, Sen. Mark Warner of Virginia said on CNN. But there is a lot of smoke.

As congressional Republican leaders begin a push to produce a legislative accomplishment before an August recess knowing the window of opportunity is closing, a series of hearings into possible Russian interference in the 2016 presidential election and other challenges that have beset the Trump administration threaten to derail their plans.

On Wednesday, the director of national intelligence, Dan Coats, and the director of the National Security Agency, Adm. Mike Rogers, will appear before Warners committee. On Thursday, Comey is expected to tell the same panel that Trump asked him to back off an investigation of former national-security adviser Michael Flynn.

An expanded version of this report appears on WSJ.com.

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Top Democrat says there's smoke, but 'no smoking gun' yet in Russia probe - MarketWatch