Former President Obama tweeted Saturday that he is “proud of” how former staffers of his administration are “continuing to fight for an America that’s better” after they penned an op-ed blasting President TrumpDonald John TrumpAlaska Republican Party cancels 2020 primary Ukrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' MORE for his “poisoning of our democracy.”

“I’ve always been proud of what this team accomplished during my administration,” he tweeted with a link to the op-ed, which was published by The Washington Post on Friday.

“But more than what we did, I’m proud of how they’re continuing to fight for an America that’s better,” he continued.

The op-ed, titled “We are African Americans, we are patriots, and we refuse to sit idly by,” was penned by 149 African American alumni of the Obama administration in support of congresswomen of color who were recently attacked by the president and told to “go back” to their home countries.

“We stand with congresswomen Ilhan OmarIlhan OmarGOP Senate candidate said Republicans have 'dual loyalties' to Israel Hillicon Valley: Zuckerberg to meet with lawmakers | Big tech defends efforts against online extremism | Trump attends secretive Silicon Valley fundraiser | Omar urges Twitter to take action against Trump tweet Omar asks Twitter what it's doing in response to Trump spreading 'lies that put my life at risk' MORE, Alexandria Ocasio-CortezAlexandria Ocasio-CortezOcasio-Cortez reveals new policies for campaign aides with children Kennedy launches primary challenge against Markey The Memo: 'Whistleblower' furor gains steam MORE, Ayanna PressleyAyanna PressleyDemocrats blast HUD for removing LGBT language from grant competition Hillicon Valley: Zuckerberg to meet with lawmakers | Big tech defends efforts against online extremism | Trump attends secretive Silicon Valley fundraiser | Omar urges Twitter to take action against Trump tweet Omar asks Twitter what it's doing in response to Trump spreading 'lies that put my life at risk' MORE and Rashida TlaibRashida Harbi TlaibMarkey fundraises ahead of Kennedy primary challenge The Hill's Campaign Report: De Blasio drops out | Warren gains support from black voters | Sanders retools campaign team | Warning signs for Tillis in NC Omar says she hopes Netanyahu not reelected MORE, as well as all those currently under attack by President Trump, along with his supporters and his enablers, who feel deputized to decide who belongs here — and who does not,”  they wrote in the op-ed.

“We refuse to sit idly by as racism, sexism, homophobia and xenophobia are wielded by the president and any elected official complicit in the poisoning of our democracy,” they added.

In recent weeks, Trump has come under fire for comments targeting the four minority lawmakers, which were condemned as “racist” in a resolution passed by the House this month.

The op-ed’s release came as the president begins to face a new wave of backlash after he called House Oversight and Reform Committee Chairman Elijah CummingsElijah Eugene CummingsDC statehood push faces long odds despite record support Federal agency to resume processing some deferred-action requests for migrants Overnight Defense: Trump says he has 'many options' on Iran | Hostage negotiator chosen for national security adviser | Senate Dems block funding bill | Documents show Pentagon spent at least 4K at Trump's Scotland resort MORE (D-Md.), who is African American, a “brutal bully” and said his Baltimore district is a “rat and rodent infested mess.”

“Rep, Elijah Cummings has been a brutal bully, shouting and screaming at the great men & women of Border Patrol about conditions at the Southern Border, when actually his Baltimore district is FAR WORSE and more dangerous,” Trump tweeted.

“His district is considered the Worst in the USA as proven last week during a Congressional tour, the Border is clean, efficient & well run, just very crowded,” Trump continued. “Cumming District is a disgusting, rat and rodent infested mess. If he spent more time in Baltimore, maybe he could help clean up this very dangerous & filthy place.”

Speaker Nancy PelosiNancy PelosiTimeline: The Trump whistleblower complaint DC statehood push faces long odds despite record support Ukraine could badly damage both Donald Trump and the Democrats MORE (D-Calif.) denounced Trump's criticisms targeting Cummings as "racist" in a tweet later on Saturday and praised the congressman as "a beloved leader."