MANCHESTER, N.H. — The campaign of Democratic presidential hopeful Bernie Sanders has launched a review of the razor-thin margin of Monday night's Iowa caucuses, Sanders's campaign manager said Tuesday.

“As an empirical matter, we’re not likely to ever know what the actual result was,” said Jeff Weaver, Sanders’s campaign manager, who cited as complicating factors the narrow margin, the “arcane” rules of the caucuses, the delayed reporting of some precincts and the technology used to reports the results.

The Sanders review may not have any practical effect on how delegates are awarded, but "I think everybody has an interest in making it as accurate as possible,” Weaver said.

Hillary Clinton and Bernie Sanders split the Iowa caucuses nearly evenly – but how? (Peter Stevenson/The Washington Post)

With all precincts reporting, the Iowa Democratic Party said Tuesday morning that Hillary Clinton had edged Sanders on the number of delegates awarded, 49.8 percent to 49.6 percent. Clinton’s campaign declared victory even before the final tallies were released.

Weaver said his campaign is reviewing tally sheets and “looking into a few other issues,” which he declined to name.

In an interview, Weaver also said that he has no second thoughts about Sanders diverting from the Iowa campaign trail last week to hold a pair of rallies in Minnesota, a state with caucuses March 1.

The events last Tuesday in Duluth and St. Paul drew more than 20,000 people but kept Sanders from making stops in Iowa for half the day, in what turned out to be the tightest Democratic caucuses in state history.

“This is a national campaign,” Weaver said. “We’re going to be campaigning all over the country. Those were good events for us.”

Sanders arrived in New Hampshire, the second nominating state, shortly after 4 a.m. Tuesday after taking an overnight charter flight from Iowa.