Greg Gianforte also was assessed a $385 fine and a six-month suspended jail sentence after pleading guilty to the misdemeanor assault charge against The Guardian's Ben Jacobs, who is Jewish.
It's not clear whether the alleged attack affected the outcome because a substantial percentage of voters had cast their ballots before the incident.
Reporters from Fox News witnessed the alleged attack on Ben Jacobs by Greg Gianforte, a tech millionaire who is endorsed by President Trump.
The flier, which shows a photo of Israeli Prime Minister Benjamin Netanyahu and President Donald Trump, includes what appears to be a fictional quote in which Netanyahu describes the U.S. as a welfare state under Israeli control.
Police say the fliers, which feature a photo of a haredi Orthodox rabbi calling for a white genocide, are covered under free speech.
The fliers are similar to others found in Missoula shortly after the Nov. 8 election.
Republican House Speaker Austin Knudsen told the Associated Press that his interest in a bill preventing a boycott of Israel came before the recent attacks on the Jewish community of Whitefish, Montana.
The meeting Wednesday in Helena comes in the wake of the postponement of a neo-Nazi armed march designed to harass the Montana Jewish community of Whitefish.
The march, scheduled for Martin Luther King Jr. Day on Monday, had been postponed because the organizers did not file the necessary paperwork.
Andrew Anglin, who runs the Daily Stormer website, said the march designed to harass the Jewish community of Whitefish will be held in February and "will be bigger and have more guns."
Opinion
Our president just asked us to be fair to white supremacistsOpinion
Our president just asked us to be fair to white supremacists