Sen. Orrin HatchOrrin Grant HatchKoch groups: Don't renew expired tax breaks in government funding bill Hatch tweets link to 'invisible' glasses after getting spotted removing pair that wasn't there DHS giving ‘active defense’ cyber tools to private sector, secretary says MORE's (R-Utah) reelection campaign is facing significant primary and general-election difficulties, a new poll found Monday.

Hatch would struggle in a primary battle against Rep. Jason ChaffetzJason ChaffetzHouse Oversight slams TSA after report says officials 'interfered' in disciplinary case Gowdy steps down from Ethics Committee, citing 'challenging workload' Criminal referrals by members of Congress raise procedural questions MORE (R-Utah), according to a Deseret News/KSL-TV poll, and the longtime Republican senator is tied with a potential general-election foe, Democratic Rep. Jim MathesonJim MathesonTrump's budget targets affordable, reliable power Work begins on T infrastructure plan New president, new Congress, new opportunity MORE (Utah).

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Forty percent of all Utah voters would renominate Hatch as the Republican candidate for Senate, while 41 percent would choose Chaffetz; 19 percent said they did not know.

Among Republican primary voters, Hatch enjoys a slight, 47-44 percent, advantage over Chaffetz, who's said he'll decide whether to challenge Hatch after Labor Day. But that number might not be as important, especially if the Republican nomination is decided by a convention. Conservative activists dominate those state conventions, and that process was what produced veteran Sen. Bob Bennett's (R-Utah) loss in a primary last year.

But one of Hatch's key arguments against Chaffetz — electability — could be undercut by other numbers in the poll, which show Hatch struggling against a top potential challenger, Matheson.

If the election were held today, Hatch and Matheson would be tied at 47 percent among Utahans, the poll found. Chaffetz enjoys a slight advantage over his fellow member of the delegation; Chaffetz would get 46 percent to Matheson's 45.

The poll, conducted June 13-16, has a 5 percent margin of error.