Federal financial disclosure laws would not require him to list the payments as a liability in his financial disclosure forms, and he would likely be free to pay it out of his own pocket. However, the use of campaign funds as hush money is illegal. Any use of federal funds if, for example, the blackmailer was a staffer or otherwise employed by the Senate would also be illegal.
Additionally, if Ensigns father, who is a wealthy casino owner and developer in Nevada, arranged to finance any payments, that could be viewed as a gift under Senate rules.
Ensign has long been seen as one of the GOPs up-and-comers a charismatic lawmaker who could carry the partys conservative message to independent voters.
Ensign was at the forefront of calls for former Sen. Larry Craig (R-Idaho) to resign after Craig pleaded guilty following a sex sting in a Minneapolis airport mens room, and he has been a strong supporter of anti-abortion and anti-gay-marriage legislation.
Although he has repeatedly denied eyeing higher office, Ensign recently made a trip to the presidential battleground state of Iowa and has used his position at the Policy Committee to build a national platform for himself.
Republican aides said that if the scandal is limited to the affair, history indicates he could recover at least some of his position. Several aides pointed out that Vitters troubles did not weaken his position with his colleagues, while former Speaker Newt Gingrich (R-Ga.) is widely considered a viable candidate for the partys presidential nomination in 2012 despite acknowledged affairs and having sought a divorce while his then-wife was in the hospital with cancer.
Republicans said it is too soon to gauge the political fallout from the scandal.
I dont know. I think the future determines that. He is a bright young man, and lots of people make mistakes, Coburn said.
DeMint said he is unsure what effect the scandal will have on his long-term position within the party.
I dont know. I really cant say. I think John Ensign is a great friend, and I think he is a great leader and obviously my hope is that hell continue to serve in the Senate for a long time, so thats really up to the people of Nevada, DeMint said.
But DeMint acknowledged the credibility gap for politicians has widened over the past few years and that for members of a party that places as much emphasis on family values and morality as the GOP, the appearance of hypocrisy can be difficult to shake.
All politicians have a credibility problem right now, and its up to us to earn the trust of the American people ... and the thing is people dont like hypocrites. Weve got to live up to what we say, he said.
Emily Pierce, Jessica Brady and David M. Drucker contributed to this report.
Former Sen. Scott Brown, R-Mass., candidate for U.S. Senate in New Hampshire, holds his hand over his heart during the singing of the national anthem as he waits to take the stage for his town hall campaign rally with Sen. John McCain at the Pinkerton Academy in Derry, N.H., on Monday, Aug. 18, 2014.