Former federal ethics chief Walter Shaub Walter Michael ShaubTrump breaks with precedent on second night of convention Democratic senators call for ethics review into Ivanka Trump's Goya tweet Chris Cuomo blasts Trump over photo with Goya products: 'In the middle of a pandemic, they're selling beans' MORE called on 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 to end the administration's migrant policies on Sunday, referring to the policies as "monstrous" in a tweet.

"Dry your eyes and focus. Your problems are nothing compared to the problems you're creating for the terrified children you're ripping from the arms of desperate parents at the border. This is monstrous. Stop it. Stop it now!" Shaub said in a tweet directed at Trump.

Dry your eyes and focus. Your problems are nothing compared to the problems you're creating for the terrified children you're ripping from the arms of desperate parents at the border. This is monstrous. Stop it. Stop it now! — Walter Shaub (@waltshaub) June 17, 2018

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The former ethics chief was referring to the administration's "zero tolerance" migrant policy at the U.S. border, which has resulted in the separation of families who have crossed into the U.S. illegally.

Shaub was responding to a tweet from the president, who was lashing out at FBI agent Peter Strzok over his text messages with then-FBI lawyer Lisa Page in the lead-up to the 2016 election.

"Why was the FBI’s sick loser, Peter Strzok, working on the totally discredited Mueller team of 13 Angry & Conflicted Democrats, when Strzok was giving Crooked Hillary a free pass yet telling his lover, lawyer Lisa Page, that 'we’ll stop' Trump from becoming President? Witch Hunt!" Trump said in a tweet on Sunday.

Why was the FBI’s sick loser, Peter Strzok, working on the totally discredited Mueller team of 13 Angry & Conflicted Democrats, when Strzok was giving Crooked Hillary a free pass yet telling his lover, lawyer Lisa Page, that “we’ll stop” Trump from becoming President? Witch Hunt! — Donald J. Trump (@realDonaldTrump) June 17, 2018

Shaub earlier in the day blasted Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE, calling her a liar after she defended the Trump administration's migrant policies on Twitter.

"Sorry, @SecNielsen, that was probably confusing. I don’t mean to be unfair. Let me try to put it in terms you’ll understand: Liar. Period," Shaub said.

Sorry, @SecNielsen, that was probably confusing. I don’t mean to be unfair. Let me try to put it in terms you’ll understand:



Liar. Period. https://t.co/wJ5bOUFlSZ — Walter Shaub (@waltshaub) June 17, 2018

Nielsen denied in a series of tweets on Sunday that the administration had a policy of separating families at the border.

"This misreporting by Members, press & advocacy groups must stop. It is irresponsible and unproductive. As I have said many times before, if you are seeking asylum for your family, there is no reason to break the law and illegally cross between ports of entry," Nielsen said.

"You are not breaking the law by seeking asylum at a port of entry," she continued. "For those seeking asylum at ports of entry, we have continued the policy from previous Administrations and will only separate if the child is in danger, there is no custodial relationship between 'family' members, or if the adult has broken a law."

"We do not have a policy of separating families at the border. Period," she added."