Trump excited the crowd yesterday with promises of bloodshed with his mass deportation policy. They wouldn’t have it any other way. Just as a reminder: Two former officials who handled immigration issues for then-President Donald Trump say that a “whole of government” approach costing billions would be needed to mount the “largest deportation effort in American history” promised in the Republican convention platform if Trump is re-elected. The exact number of people who would be deported in a second Trump administration is hard to pin down. During the June 29 presidential debate, Trump claimed there were 18 million undocumented immigrants in the U.S. One of the two former Trump officials said it could be as high as 30 million. The last official estimate in 2022 was under 11 million, but when you count the American children and other Americans caught up in the raids by mistake, they can probably get to 20 million or so. Last week, according to Semafor, a former acting ICE director under Trump who is seen as a possible Department of Homeland Security chief in a second Trump administration told a conservative conference, “They ain’t seen s— yet. Wait until 2025.” “Trump comes back in January,” Tom Homan said, “I’ll be on his heels coming back, and I will run the biggest deportation force this country has ever seen.” So, what’s it going to take? NBC News asked acting ICE Director Patrick J. Lechleitner about what would be required to deport millions of people. “It’s not only putting…