People pretending to work for Sen. Mark PryorMark PryorCotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm Top Democrats are no advocates for DC statehood MORE (D-Ark.) are calling Arkansas homes to find out how many guns families own, according to the lawmaker’s Twitter account.

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“Imposters r calling homes saying they're w my office & asking ab # of guns fams own. Dirty political trick. Im strong 2 amdt guy & gun owner,” read a Tweet posted to Pryor’s account Friday evening.

Pryor asked voters who receive the calls to report them immediately to the Federal Trade Commission, whose number he listed.

“These imposters r committing criminal fraud. If you receive 1 of these calls, file complaint w/ FTC,” he wrote minutes later.

A spokeswoman for Pryor said they first realized the calls were being made when several Arkansans called the senator’s state office to complain. Pryor’s office does not have any information about who was making the calls, the spokeswoman said.

Pryor has delivered a tempered approach to the gun-control debate in the upper chamber, opting not to support the assault weapons ban proposed by President Obama and Sen. Dianne FeinsteinDianne FeinsteinDem: Trump's China trademark looks like a quid pro quo Senate advances Trump's Commerce pick Flynn told FBI he didn't talk sanctions with Russian envoy: report MORE (D-Calif.).

Instead, Pryor has come out in support of a bill that would prohibit people who have been deemed “mentally incompetent” from being allowed to pass a criminal background check when attempting to buy a gun.

The two-term senator is facing a tough reeelection in 2014 as support for Democrats has severely waned in the southern state recently. Both the Senate Conservatives Fund and the Club for Growth have already targeted the Democrat with ads tying him to Obama.

Early Saturday morning, Pryor was one of only four Democrats to vote against the Democratic-led budget resolution, which narrowly passed the Senate 50-49.

Obama lost Arkansas by more than 20 percentage points in 2012, and Republicans believe they can take the reddening state, but none have yet made their bids for the seat official.

Former President Bill ClintonBill ClintonMoulitsas: Trump’s warped sense of reality Syrian safe zones: Trump's best bet for refugee relief, regional stability Chelsea Clinton attends Muslim solidarity rally in NYC MORE, the former governor of the state, helped launch Pryor’s campaign last weekend, holding a number of fundraisers.

--This report was updated at 2:33 p.m.