A new poll has presidential candidates Hillary Clinton and Donald Trump in a statistical dead heat here in Arizona.

In a poll of 728 likely Democrat, Republican, Independent and non-declared voters, 40 percent said they would vote for Clinton while 39 percent said they would vote for Trump.

The poll gives Libertarian Gary Johnson 7 percent and Green Party candidate Jill Stein 1 percent of the vote. An additional 13 percent said they were undecided.

The margin of error of the phone-based poll is roughly 4 percent.

The same poll by predictive insights a month ago had Clinton ahead of Trump by 3 percent.

In the last six presidential contests, Arizona was won by a Republican five times. The last Democratic candidate to carry Arizona was Bill Clinton two decades ago in 1996.

Mike Noble, managing partner of OH Predictive Insights and chief pollster, said Trump has begun to catch-up to Clinton.