See Dick figure! Figure, figure, figure!

23% of Federal inmates are illegal immigrants. Border arrests are up 240%. In the Great State of Texas, between 2011 & 2018, there were a total of 292,000 crimes by illegal aliens, 539 murders, 32,000 assaults, 3,426 sexual assaults and 3000 weapons charges. Democrats come back!

— Donald J. Trump (@realDonaldTrump) January 12, 2019

Um, no.

According to DHS status indicators, over 276,000 criminal aliens have been booked into local Texas jails between June 1, 2011 and December 31, 2018, of which over 186,000 were classified as illegal aliens by DHS.

So, not even close to accurate.  Besides, there are allegations of a crime, and convictions of crimes, and one person can be charged with multiple offenses:

Between June 1, 2011 and December 31, 2018, these 186,000 illegal aliens were charged with more than 292,000 criminal offenses which included arrests for 539 homicide charges; 32,443 assault charges; 5,695 burglary charges; 36,840 drug charges; 395 kidnapping charges; 15,859 theft charges; 23,487 obstructing police charges; 1,650 robbery charges; 3,428 sexual assault charges; 2,152 sexual offense charges; and 2,949 weapon charges. DPS criminal history records reflect those criminal charges have thus far resulted in over 120,000 convictions including 238 homicide convictions; 13,559 assault convictions; 3,138 burglary convictions; 17,806 drug convictions; 173 kidnapping convictions; 7,064 theft convictions; 11,264 obstructing police convictions; 1,011 robbery convictions; 1,689 sexual assault convictions; 1,148 sexual offense convictions; and 1,280 weapon convictions.

And this morning there's this:

Thousands of illegal aliens who have committed sexual crimes against children are right now in Texas prisons. Most came through our Southern Border. We can end this easily - We need a Steel Barrier or Wall. Walls Work! John Jones, Texas Department of Public Safety. @FoxNews

— Donald J. Trump (@realDonaldTrump) January 13, 2019

I can give you one year of statistics on crime in Texas.  Latest numbers only run through 2017, and each year is a separate report (v. the aggregate for criminal aliens).  The total number of sexual assaults reported in 2017 was 18, 112.  This was a 1.3% decrease over 2016. The number of offenders, however, was up by 5%.  The number of criminal aliens in that total figure is difficult to calculate since the first set of numbers covers 7 years.  But back of the envelope calculating yields about 0.9% of sexual assaults in 2017 may have been caused by criminal aliens.  So a wall would make us 0.9% safer?  No, probably not even that much safer.

Maybe you want to build that wall on the Oklahoma side of the Red River.

As for all those "criminal aliens" coming over the "Southern Border" (only a true Yankee would use that term), DPS reports:

For the purposes of this report, the term "criminal alien" refers to an individual who has been identified as an alien by DHS and who has been arrested for a state criminal offense, typically a Misdemeanor B or higher, committed in Texas.

There is no way to distinguish between immigrants crossing the Mexican border illegally, and immigrants overstaying visas, in these statistics.