President Donald Trump‘s approval ratings on immigration have dropped since his second term started in January.

Four national polls conducted in April show that most of the public is no longer behind Trump, particularly at a time when the White House has tried to keep one storyline — that of deported Salvadoran citizen Kilmar Abrego Garcia — front and center in voters’ minds.

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Abrego Garcia was removed without due process under the Alien Enemies Act in March, only for the Justice Department to later admit that it was the result of an administrative error.

Despite a federal judge’s order that the United States facilitate his return to the U.S., he has not been pulled out of the mega prison in El Salvador where he is being held.

His legal case has been the leading immigration matter at that time, potentially to blame for shrinking support for Trump on immigration, even as the White House has repeatedly doubled down on Abrego Garcia’s criminality at press briefings week after week.

A March poll by AP-NORC Center for Public Affairs Research showed that Trump just barely scored higher in how he handled immigration in his first two months in office than any other issue, particularly trade and the economy. He earned a 49% approval rating on immigration among U.S. adults surveyed at the time.

The latest poll, conducted by the Economist and YouGov from April 19-22, revealed that just 41% of U.S. adults backed Trump’s immigration policy compared to 54% who did not. In March, 53% of respondents had approved.

A mid-April survey done by Reuters/Ipsos concluded 45%-46% supported and did not support Trump on this policy. Last month, support was higher: 49%–44%.

In the first half of April, the tide had already begun to shift. Split evenly, 50%-50%, U.S. adults were split on how Trump was implementing his immigration agenda, according to a CBS News / YouGov poll.

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In March, Trump received 53%-47% score in the CBS News/YouGov survey.

Finally, Quinnipiac recorded one of the biggest splits for Trump between April 3-7, 45% in support compared to 50% in opposition. That shifted from Trump’s first week in office, when 47% of people backed his approach to immigration and 46% opposed it.