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A new national poll from Bloomberg shows Hillary Clinton holding a 12-point lead on Donald Trump. 

The former First Lady, after officially clinching the Democratic nomination and gaining the endorsement of President Obama, garnered 49 percent support in the survey, with Trump at 37 percent and libertarian candidate Gary Johnson picking up nine percent. Only four percent said they were undecided.

The poll of likely voters, taken from June 10-13, found that 55 percent of respondents said they would "never" vote for the presumptive GOP nominee, with 43 percent expressing that negative sentiment about Clinton. 

Bloomberg said that it added additional questions on terrorism and gun control on June 13, after the Orlando terror attack. 

Trump outperformed Clinton by a margin of 45 to 41 percent on the question of which candidate a voter would have more confidence in if a terror attack similar to the one in Orlando unfolded a year from now.

Trump also edged Clinton by five points on a question about whether the phrase "would combat terrorist threats at home and abroad" better describes Trump or Clinton.

Americans remain evenly divided on whether there should be a ban on the sales of "semiautomatic or automatic rifles" to civilians, with 50 percent opposing such a ban and 48 percent supporting it.  

Bloomberg said this telephone survey was the first major poll taken "since the mass shooting, heightened furor over Trump's statements about the judge, and Clinton’s June primary victories in California and other states that cemented her status as the presumptive Democratic nominee."

Heather Childers discussed the new numbers with Fox News political experts Joe Trippi and Ed Rollins.

Ed Rollins said that Trump's "unfavorable" ratings - which reached 70 percent in a recent ABC News-Washington Post poll - are unprecedented in modern politics.

"I've never seen that number in my 50 years in politics. He clearly has to get that down. At the end of the day if people don't like you, they're not gonna vote for you," said Rollins.

He also noted that Trump is losing some support among men, which has been his major advantage over Clinton. Rollins said Trump's numbers could improve in upcoming polls taken after the Orlando terror attack. 

Trippi said Trump "tends to overstep" on some of his arguments and that could be turning off voters. He noted that this is only one poll and could be an aberration or signal "real trouble" for Trump.

Watch the America's Newsroom discussion above.