CNN contributor and Republican strategist Ana Navarro on Wednesday slammed Sen. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.) after he said Republican lawmakers aren’t publicly critical of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE because “it means siding with the media.”

“Many Republicans won’t criticize Trump even when they don’t agree with him [because] it means siding with a media that nevers [sic] cuts him a break, turns even little things he does into an act of evil, are also unfair to them & in the end will still attack you anyway,” Rubio said on Twitter Tuesday morning.

Many Republicans won’t criticize Trump even when they don’t agree with him b/c it means siding with a media that nevers cuts him a break,turns even little things he does into an act of evil,are also unfair to them & in the end will still attack you anyway https://t.co/jv3A18ka4V — Marco Rubio (@marcorubio) June 27, 2018

Navarro responded to Rubio’s remarks in a fiery tweet just hours later.

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“Let me fix this for u, Marco,” Navarro wrote. “Many Republicans, including u, won’t criticize Trump even when they know he’s dividing the country, cheapening the Presidency, diminishing America’s standing, causing unspeakable pain to families, & is all around horrible, BECAUSE THEY HAVE NO SPINE.”

Let me fix this for u, Marco:



Many Republicans, including u, won’t criticize Trump even when they know he’s dividing the country, cheapening the Presidency, diminishing America’s standing, causing unspeakable pain to families, & is all around horrible, BECAUSE THEY HAVE NO SPINE https://t.co/bicB15bsfH — Ana Navarro (@ananavarro) June 27, 2018

Navarro, who supported former Florida Gov. Jeb Bush in the 2016 Republican presidential primary, was previously described in reports as a personal friend of Rubio's.

The Republican strategist also slammed GOP lawmakers as "cowards" for not standing up to Trump earlier this month.

Navarro's remarks then arrived on the heels of Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE's defeat in a South Carolina GOP primary.

Sanford had repeatedly criticized the president and his opponent used that as an issue in the primary.

Trump was heavily involved in the primary and ripped into Sanford while supporting his rival, even as voters were still heading to the polls in the state.