And, if you read the whole article, you'll see that his comments only received slight opposition. Normally one would expect his comments to be edited out if they weren't willing to provide some form of answer from either another panelist or the host.
This appears to be part of a trend with the NewsHour where they feature one-sided immigration "debates", such as David Brooks and Mark Shields both supporting amnesty.
Please send a short, polite note to their ombudsman suggesting that they have real debates about this issue instead of just spreading propaganda:
http://www.pbs.org/ombudsman/feedback.html
Of course, when all else fails, whip out the race card.