Via Syracuse University's TRAC:

The latest case-by-case Immigration and Customs Enforcement data reveal that its use of detainers, commonly called immigration holds, began to increase last year well before either the election or inauguration of Donald Trump. Once President Trump assumed office, detainer usage rose rapidly. By March 2017, the second full month of the Trump Administration, ICE recorded preparing 13,971 detainers - up 31.7 percent from January's level.

Against a longer time frame, the number of detainers issued in March of 2017 is still slightly lower than during March of 2014. It is also only half the level of six years ago (March 2011) when ICE detainer usage peaked. See Figure 1.




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