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 on Wednesday argued it would be "simple" to fix immigration laws if Democrats agreed to a solution and claimed illegal immigrants are "using children" to exploit judges to get into the country.

"Democrats in Congress must no longer Obstruct - vote to fix our terrible Immigration Laws now. I am watching what is going on from Europe - it would be soooo simple to fix. Judges run the system and illegals and traffickers know how it works. They are just using children!" Trump tweeted.

Democrats in Congress must no longer Obstruct - vote to fix our terrible Immigration Laws now. I am watching what is going on from Europe - it would be soooo simple to fix. Judges run the system and illegals and traffickers know how it works. They are just using children! — Donald J. Trump (@realDonaldTrump) July 11, 2018

The president sent the tweet as he was headed to a working dinner in Belgium at the NATO summit.

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Trump has faced fierce criticism in recent weeks over his administration's "zero tolerance" policy on illegal immigration, which led to the separation of thousands of migrant children from their families.

Trump downplayed responsibility for the separations on Tuesday before heading to Europe, saying the solution is "not to come to our country illegally."

Trump and other White House officials have frequently blamed Democrats for ongoing immigration issues, saying party members have failed to come to the table to hammer out an agreement on immigration.

The president has sent mixed messages in recent weeks on how he'd like to see lawmakers address the issue. Trump told GOP lawmakers he was behind them "1,000 percent" in their efforts to pass immigration legislation last month, but when the first of two measures failed, he declared they were "wasting their time."

He later urged Republicans to pass the second, more moderate measure, but it failed as well.

Trump has also rejected calls to increase the number of immigration judges, which lawmakers argue would help handle the backlog of illegal entry cases and more quickly adjudicate asylum claims. Lawmakers have suggested hiring a couple hundred additional judges, but Trump has repeatedly suggested the number is in the thousands.