So in all actuality, you oppose the border wall, and thus you, in all reality, aren't serious about stopping illegal immigration. Explains your opposition to Trump! As for price, you can't really put a price on national security. I doubt you know either how much it'll cost either way.
What about 50 trillion dollars? Is that too much? In a game of hypothetical questions, Beaverbrook asked the lady: ‘Would you live with a stranger if he paid you one million pounds?’ She said she would. ‘And if be paid you five pounds?’ The irate lady fumed: ‘Five pounds. What do you think I am?’ Beaverbrook replied: ‘We’ve already established that. Now we are trying to determine the degree.”