Frequent President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE critic Rep. Ted Lieu (D-Calif.) called out first lady Melania Trump Melania TrumpMelania Trump: Ginsburg's 'spirit will live on in all she has inspired' The Hill's 12:30 Report - Presented by Facebook - You might want to download TikTok now Warning label added to Trump tweet over potential mail-in voting disinformation MORE over the Trump administration’s new policy to separate immigrant children from their parents at the border.

In an early Saturday tweet, Lieu appealed to the first lady about the issue, saying her husband’s directive is not in line with her “Be Best” anti-bullying initiative.

“Dear @FLOTUS: Separating toddlers from parents is definitely not a #BeBest policy,” Lieu tweeted. “Are you going to do anything about it?”

“No one can take your #BeBest children's agenda seriously when your husband's policy rips kids from their parents and loses track of the children,” he added.

Dear @FLOTUS: Separating toddlers from parents is definitely not a #BeBest policy. Are you going to do anything about it?



No one can take your #BeBest children's agenda seriously when your husband's policy rips kids from their parents and loses track of the children. https://t.co/IQTSrvTVP4 — Ted Lieu (@tedlieu) May 26, 2018

Lieu is one of President Trump’s harshest critics, and has been vocal about issues of immigration. On Friday, he called the new zero-tolerance policy “evil” and said that “it would shock Jesus.”

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The first lady earlier this month announced “Be Best,” her platform on children’s issues including well-being and social media use.

She has faced ridicule from Trump critics for her focus on anti-bullying and cyberbullying, with many pointing to her husband’s name-calling and Twitter attacks directed at his political opponents.

Earlier this month, Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE announced that the administration would step up its efforts at protecting the border by increasing prosecution of parents who enter the U.S. illegally, including separating them from their children if necessary.

It was reported last month that federal officials lost track of nearly 1,500 unaccompanied migrant children after they were placed with adult sponsors.