Donald Trump stated on July 24, 2015 in an interview on MSNBC's "Morning Joe.":
The number of illegal immigrants in the United States is "30 million, it could be 34 million."
"I don't think the 11 million which is a number you have been hearing for many many years, I've been hearing that number for five years I don't think that is an accurate number anymore," Trump said on MSNBC’s Morning Joe July 24. "I am now hearing it's 30 million, it could be 34 million, which is a much bigger problem."
https://www.politifact.com/factchecks/2015/jul/28/donald-trump/donald-trump-says-number-illegal-immigrants-30-mil/