Donald Trump launched new attacks on 'Morning Joe' co-host Mika Brzezinski, branding her 'very dumb' and mentally unstable after the show criticized his weak ground strategy in Florida.

On Friday, Trump tweeted: 'Just heard that crazy and very dumb @morningmika had a mental breakdown while talking about me on the low ratings @Morning_Joe. Joe a mess!'

Trump frequently appeared on the MSNBC show until he started a fight with co-host Joe Scarborough in May, declared a boycott on the program and then claimed the two hosts were romantically involved.

Donald Trump launched new attacks on 'Morning Joe' co-host Mika Brzezinski, branding her 'very dumb' and mentally unstable after the show criticized his weak ground strategy in Florida

The co-hosts were initially criticized for being too cozy with Trump until a Twitter spat broke out in May. In late August, the feud escalated when Trump personally tore into the left-leaning Brzezinski, by calling her 'off the wall', 'neurotic' and a 'not very bright mess'

While Trump's famous feud with Megyn Kelly has petered out, his attacks on Brzezinski have intensified despite a brief attempt to soften his tone and adhere to a script.

A panel on Friday's episode of Morning Joe pointed out that Trump's campaign has just one field office in Florida, compared to Obama's 102 during the 2012 election.

Trump responded on Twitter by blasting the co-hosts before he wrote: ' People will be very surprised by our ground game on Nov. 8. We have an army of volunteers and people with GREAT SPIRIT! They want to #MAGA!'

The co-hosts were initially criticized for being too cozy with Trump, who frequently appeared on the show, but on May 6, he said the 'rapidly fading' show was pushing for a third candidate to run.

Scarborough, a former Republican congressman in Florida, shot back and Trump eventually announced a boycott of the show, writing: 'They misrepresent my positions!'

In late August, the spat escalated when Trump personally tore into the left-leaning Brzezinski, by calling her 'off the wall', 'neurotic' and a 'not very bright mess'.

In May, Trump said the 'rapidly fading' show was pushing for a third candidate to run before announcing his boycott

Trump also claimed Brzezinski and co-host Joe Scarborough were romantically involved (pictured on a segment this week where the two bantered about whether Trump is a psychopath or a sociopath)

He added: 'Some day, when things calm down, I'll tell the real story of @JoeNBC and his very insecure long-time girlfriend, @morningmika. Two clowns!'

Brzezinski went after Trump last week on the early-morning show following a segment about Trump's escalating attacks on Clinton.

Speaking directly to the candidate who wasn't on the show, Brzezinski said: 'Donald Trump, you have no idea what your words mean.'