Former GOP presidential hopeful Jeb Bush shared some rather dismal predictions for a Donald Trump presidency, but didn't discount that it could happen.

Bush sat down for his first conversation since Trump became the presumptive Republican nominee chatting with his brother's former White House communications director Nicolle Wallace on MSNBC.

The former Florida governor, who dropped his bid for the White House in February, on the night of the South Carolina primary, said voters will 'feel betrayed' by Trump because some of his campaign promises – from building a Mexican border wall to banning non-American Muslims from the country – would never materialize.

He also told Wallace, who started her career as his press secretary, that he would feel 'sad' if Hillary Clinton won the White House, but 'worried' if Trump was triumphant.

'That's why I can't vote for either candidate,' Bush revealed.

'I can't vote for Donald Trump and I can't vote for Hillary Clinton. It breaks my heart,' he said. 'This is my first time in my adult life I'm confronted with this dilemma.'

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Former Florida Gov. Jeb Bush made comments today about Donald Trump, suggesting that if he were to get elected than the electorate would be disappointed

Former GOP hopeful Jeb Bush (left) sat down with his brother's former White House communications director Nicolle Wallace for a conversation to be aired tonight on MSNBC

Looking back at what happened throughout the race, Bush threw a couple of backhanded compliments at Trump's way.

'Trump, you know, to his credit was very smart at exploiting these kinds of opportunities,' Bush told Wallace as they sat down near his family's compound in Kennebunkport, Maine.

'He's a master at understanding how the media works – more than anybody I’ve seen in politics,' the former governor continued.

'Kudos to him for, you know, kind of creating the environment and then manipulating the environment to his effect,' Bush added.

Bush, who had a well-funded super PAC to do his bidding, was branded early on as a frontrunner, with many political prognosticators expecting a do-over from 1992, a Bush against a Clinton.

But the Republican electorate was not interested in voting for the old guard, with Trump and also Sen. Ted Cruz, who's often broken ranks with his colleagues on Capitol Hill, pushing them rightward, as two of the last three candidates standing.

'They wanted their voice heard. They still do,' Bush said of Republican primary voters. 'They're angry for legitimate reasons. They latched onto the big horse. All of which is logical to me in retrospect.'

'In the midst of it, it wasn't very logical,' he added, noting that 'no wise person' Bush knew had predicted the political rise of Donald Trump.

Before there was 'Lyin' Ted' and 'Little Marco,' Trump branded Bush as 'low energy,' a moniker that plagued the wonkish and often soft-spoken ex-governor throughout his campaign.

Bush insisted that he was the Republican, in the very crowded field, who did push back against Trump's insults.

'if you look at the campaign I spent most time pushing back on all that nonsense,' Bush said. 'Everybody else was in the witness protection program for a while.'

After Bush dropped out the wounds still festered.

'So, you know, kudos for the guy for his, you know, I think he just – he plays by his gut,' Bush said.

'He sensed an opening – this deep disaffection – and he played it like a Stradivarius violin,' the politician added.

Moving forward, Bush won't endorse Trump. He won't come to the convention. And he articulated to Wallace why he plans to abstain from voting in November.

'Yeah. I can't do it. I can't do it,' Bush said, expressing surprise when Wallace admitted that she couldn't vote for the McCain-Palin ticket in 2008 because she doubted the Alaska governor's qualifications to be vice president, which was documented in the book and then movie 'Game Change.'

Bush gave his ex-aide some grief for that decision saying that vice president and president are different and that McCain 'got over that hurdle in flying colors.'

But Wallace countered and asked what would happen if nobody votes. 'I mean that's not what you want. You're the son and brother of two commanders in chief. We live in extraordinary times,' she argued.

'I respect people going through the process and saying this is a binary decision. I've heard that term, fancy language,' Bush replied, but stood his ground.

'Yeah. I can't do it. I can't do it,' he said, telling Wallace to 'sort it out' for herself. 'I've reached my conclusion after deep thought and prayer about this,' Bush said.

When asked who would be the better commander-in-chief, Bush couldn't choose on that question either.

'Neither for me. And you're not going to get me to change that,' he replied.

'This whole last two weeks with Hillary Clinton where she was indicted, effectively by the FBI director, you know, everything but the indictment took place, basically said that she lied,' he explained.

He said there was a 'pattern there' with the likely Democratic nominee that he couldn't 'get past.'

'And Donald Trump does the exact same thing in a different way,' Bush added. 'We're in perilous times in our country and we need principled centered leadership.'

Jeb Bush isn't alone in his resistance to Trump.

His father, former President George H.W. Bush, and his brother, President George W. Bush, both won't be attending the Republican National Convention, which kicks off next week in Cleveland, Ohio.

The former Florida wouldn't reveal who the elder Bush and his mother, Barbara Bush, planned to vote for because he said he didn't know.

'I'm not really asking them. I don't want to ask,' he said.

Today, once Bush delivered his half-hearted 'kudos' to Trump, he explained how the presumptive nominee will be a disappointment when elected.

'The tragedy of this though, is that there isn't going to be a wall built. And Mexico's not going to pay for it. And there's not going to be ban on Muslims,' Bush said, noting that it's 'like an alternative universe he created.'

'And people are going to be deeply frustrated and the divides will grow in our country,' Bush continued. 'This extraordinary country, still the greatest country on the earth, will continue to stagger instead of soar.'

'And that's the heartbreaking part of this,' Bush added. 'Is that I think people are really going to be betrayed.'

Bush then gave some more 'kudos' and a final dose of shade.

'So ... kudos for Trump for winning the nomination. It was extraordinary. And you can't -– can't take that away from him,' Bush said. 'He's the presumptive nominee and he earned it.'

'Now he needs to run for president,' Bush said.