"I don’t rule anything out," Walked told ABC's "This Week" program.
Walker also balked at the suggestion that he should make a commitment to the voters of Wisconsin that he would serve out his full second term if reelected.
"In my case, I have never made that commitment because to me it's not about the time you serve in office," Walker said. "I feel right now my calling is to be the governor of the state of Wisconsin, that's where I'm called to."
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Walker said his ideal Republican presidential nominee would be someone who is a Washington outsider, and either a current or former governor.
"I think it’s got to be an outsider," Walker continued. "I think both the presidential and the vice presidential nominee should either be a former or current governor -- people who have done successful things in their states, who have taken on big reforms, who are ready to move America forward."
He was asked specifically if he would therefore rule out Republican Sens. Marco Rubio, Ted Cruz, and Rand Paul. They are often listed in the front pack of those likely to seek the Republican nomination in 2016.
"All good guys, but... it’s got to be somebody who’s viewed as being exceptionally removed from Washington," he responded.
"People who have done successful things in their state who have taken on big reforms, who are ready to move America forward," Walker said. "I think it's got to be somebody who is viewed as being exceptionally removed from Washington."
Walker gained national attention three years ago during the state legislature's battle to strip some bargaining rights from unions, prompting tens of thousands of protesters to converge on the Capitol in protest for several weeks.
Walker said the reforms were necessary, because the system was broken.
As for the current political climate in the nation's Capitol, Walker criticized Republicans for their role in the recent government shutdown and said that it has led to the lowest congressional approval ratings in the nation's history.
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