As the left gears up to resist President-elect Donald Trump’s coming cleanup of the Biden migrant mess, evidence of the need for it grows ever more stark — whether you want a simple, telling tale or cold, hard data.First came the Texas State Troopers’ Thanksgiving Day rescue of a 10-year-old Salvadoran boy left for dead by smugglers in a desolate desert area in Maverick County, Texas.How many other tots have the coyotes abandoned who weren’t lucky enough to get found? And the troopers picked him up — sobbing, alone and carrying nothing but a cellphone — just days after border officials found a 2-year-old Salvadoran girl crossing with only a note of a phone number.Meanwhile in New York, The Post broke the news that the illegal-migrant surge has left more than 58,000 criminal “asylum seekers” in New York City, and over 670,000 nationwide.Whether convicted felons or only facing criminal charges, this population is proof that the Bidenite claims to vet migrants are as hollow as their insistence that their policies were “humanitarian.”The ICE data also show at least 1,000 gang members among the criminal migrants in the city, goons like the two Tren de Aragua gangbangers arrested last week in an early-morning Bronx raid targeting a major NYC drug-trafficking and credit-card scam — a raid that also netted an arsenal of assault rifles.The TdA pair were allegedly part of a gun-toting group of bandits who stormed an Aurora apartment in August in a viral caught-on-camera burglary; one of them had been ordered deported by an immigration judge in February.Post readers won’t be surprised that these gangbangers chose to flee the Aurora heat by hiding among the hundreds of thousands of illegal immigrants in America’s largest sanctuary city.Trump’s border czar-designate, Tom Homan, says the new team’s first deportation priority will be removing the million-plus criminal aliens ICE already knows about.We look forward to watching Denver Mayor Mike John...