Sen. Mike EnziMichael (Mike) Bradley EnziWe can't allow Congress to take earned benefits programs away from seniors Senate approves Trump's debt deal with Democrats Senate panel might not take up budget until October MORE (R-Wyo.) has stepped up his fundraising game in the face of a potentially tough primary, bringing in almost $850,000 in the last three months.

Enzi was outraised by primary challenger Liz Cheney (R), who topped $1 million in the same period.

But the haul is a huge increase over the $100,000 he raised in the previous quarter, and shows he's able to raise large sums when pressed. Enzi now has $1.2 million in the bank.

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"Diana and I have been humbled by the overwhelming support we have received from people across our great state," Enzi said in a statement.

"Friends, old and new, have offered their help, advice and prayers. We are so proud to stand side-by-side with these great folks from every corner of Wyoming."

Polling shows Enzi has a big early edge in the race, and much of Wyoming's political establishment has united behind his campaign. 

Cheney is the daughter of former vice president Dick Cheney.