Sen. Orrin Hatch (R-Utah) raised $1.3 million in the second quarter, as he faces a likely state GOP convention challenge in his quest for a seventh term.

Hatch now has $3.4 million in the bank, a total that is just one in a series of strong quarterly reports announced by Republican Senators and Senate candidates.

Sen. Bob Corker (Tenn.) raised $2.6 million, Ohio Senate candidate Josh Mandel brought in $2.3 million and Sen. Scott Brown (Mass.) took in nearly $2 million and ended June with $9.6 million in the bank.

Sen. Dick Lugar (Ind.) raised $900,000 and Rep. Jeff Flake raised $800,000 and has more than $2 million in the bank for his campaign for the Arizona’s open Senate seat. Sen. Dean Heller (Nev.) raised more than $1 million, but was slightly outraised by Rep. Shelley Berkley (D-Nev.), who took in $1.2 million.

Of those, all but Mandel are running to keep Republican-held seats. Democratic incumbents posted strong numbers for the quarter as well, as the party looks to hold on to its three-seat majority. Republicans are targeting several Democratic seats, including those in Montana, Virginia, Florida and Missouri.

Hatch will likely face a challenge from Rep. Jason Chaffetz, a second-term Republican who has criticized Hatch’s votes on issues including raising the debt ceiling. Along with raising money, Hatch is reaching out to tea party groups and is working at the local level to get supporters elected as delegates to next year’s convention.

“Senator Hatch has been fortunate to receive great support from people across our state and nation,” Hatch campaign manager Dave Hansen said. “He is particularly proud of the many people who have joined with him in fighting for lower taxes, less spending, and fiscal responsibility.”