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Sen. Ben Sasse (R-NE) called for an "adult" third-party candidate to run in the presidential election, rejecting the choice between Donald Trump and Hillary Clinton. 

"Why shouldn’t America draft an honest leader who will focus on 70% solutions for the next four years? You know...an adult?" he asked.

Sasse's call comes amid reports that the Bush family will not endorse Trump and that Mitt Romney will not attend the GOP convention. 

In the open letter, Sasse describes his discussions with locals at a Fremont, Nebraska Walmart. 

He said that a Trump supporter told him: 

"Please understand: I’m going to vote for him, but I don’t like him. And I don’t trust him – I mean, I’m not stupid. But how else can I send a signal to Washington?!"

Sasse then laid out 10 reasons why the country needs another option. He called out the unpopularity of both Trump and Clinton, joking that "dumpster fires" are more popular.

In the history of polling, we’ve basically never had a candidate viewed negatively by half of the electorate. This year, we have two. In fact, we now have the two most unpopular candidates ever – Hillary by a little, and Trump by miles (including now 3 out of 4 women – who vote more and influence more votes than men). There are dumpster fires in my town more popular than these two “leaders.”

The freshman senator, who has vocally opposed Trump in recent months, argued that both parties are on the verge of collapse.

"These two national political parties are enough of a mess that I believe they will come apart," he wrote. 

"It might not happen fully in 2016 – and I’ll continue fighting to revive the GOP with ideas -- but when people’s needs aren’t being met, they ultimately find other solutions."

He said that he would not be open to running. 

Read the full letter above.

How will Trump unify the splintered GOP? Megyn Kelly discusses that with Trump campaign spokesperson Katrina Pierson, tonight on The Kelly File at 9:00 ET. Plus, hear from Michael Moore and Frank Luntz.

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