(CNN) - He's dealing with major controversies in his home state of New Jersey, but nationally Gov. Chris Christie remains one of the GOP's most potent rainmakers.
And Tuesday night Christie heads to New York City to attend a gathering and fundraiser for Senate Republicans, as they try to win back the chamber this November from the Democrats.
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Christie is scheduled to speak at the National Republican Senatorial Committee's "Majority Makers Policy Retreat." The event, at the storied Harvard Club, will include major donors and supporters of the GOP.
"This is an event where donors interact with senators and candidates. The governor will be talking about the importance of winning back the Senate majority this fall, and how the Republican Party can compete and win in all corners of this country, including blue states," a senior aide to Christie told CNN.
Senate Minority Leader Mitch McConnell and Sens. Orrin Hatch of Utah and Jerry Moran of Kansas will be in attendance, a source with knowledge of the event told CNN. Democrats hold a 55-45 majority in the Senate (53 Democrats and two independents who caucus with the party), but are defending 21 of the 36 seats up for grabs in November's midterm elections. And half of the seats the Democrats are defending are located in red or purple states.
While assisting Senate Republicans Tuesday night, as chairman of the Republican Governors Association, Christie's main political task right now outside of the Garden State is to raise as much money as possible to help GOP governors and gubernatorial candidates win elections this year. Thirty-six states hold gubernatorial contests in November, with the GOP defending 22 of those seats.
Christie's problems back home
Christie's administration is facing multiple investigations in a controversy that has shaken the governor's political future. State lawmakers and the U.S. Attorney's Office are looking into allegations that top Christie appointees orchestrated traffic jams from September 9-13 by closing access lanes to the George Washington Bridge in Fort Lee to politically punish that town's mayor for not endorsing the governor's re-election.
Christie has denied knowing anything about the gridlock until after it occurred, and has said he knew nothing about any political mischief by members of his administration. He's also facing allegations by the Democratic mayor of Hoboken, New Jersey, that members of his administration held Superstorm Sandy recovery funds hostage in exchange for approval of a real estate development project in that city.
Christie's reaction to the deadly and destructive storm, which slammed into New Jersey and New York in late October 2012, launched him further into the national spotlight, sent his approval ratings in the Garden State soaring, and helped him easily win re-election last November.