Extremely serious questions are being raised about Russian meddling in the U.S. presidential election. Hillary campaign manager Robby Mook is pulling no punches about the source of leaked DNC emails released via Wikileaks. Experts have told the campaign that the emails, seized via a Russian hack, are being used to help elect Donald Trump.

Questions about whether the Russians are connected to the DNC email leak on the eve of the Democratic convention are very concerning. As Mook notes, this comes just one week after Donald’s alarming comments about NATO and his advisers having successfully weakened the Republican Party’s platform with respect to Ukraine, reneging on a promise to provide aid to the Ukrainians in their struggle against Russian aggression.

There have long been questions about some of Donald’s advisers’ ties to foreign governments. In particular, his campaign co-chair Paul Manafort has built a career specializing in working for arms dealers, dictators, and foreign oligarchs. He was “for many years on the payroll of the Putin-backed former president of Ukraine, Viktor Yanukovych.”

In this profile of Manafort, Franklin Foer documents his long-term relationship with Donald, which has existed in tandem with some of the most odious tyrants around the globe.

Further, as TPM’s Josh Marshall details, “Trump appears to have a deep financial dependence on Russian money from persons close to Putin. …There is also something between a non-trivial and a substantial amount of evidence suggesting Putin-backed financial support for Trump or a non-tacit alliance between the two men.”

This is as a result of Donald’s necessarily reliance on foreign money because his repeated business failures and bankruptcies mean that American banks won’t lend to him. Despite his business acumen being touted as his key qualification for the US presidency, it is the very lack of his skills as a businessman which have brought him to a point in which he depends on foreign cash — which in turn may have now critically compromised the Republican nominee for the presidency.

The story is exploding into the mainstream after gaining increasing traction in recent days.