This is an absurd idea since not all countries are equal. Our ability to evaluate the character of a person seeking entry is dependent upon the transparency and integrity of the system from which they come; a closed system where immigrants can easily or even routinely bribe officials to get paperwork needed to come to the US is not equal to a system where such bribery is very difficult and where there is a lively free press to report on news relating to crime and other activities. In the former system it is impossible to clear a person as a person of character; in the latter we have more reliable information, from various perspectives, on a person's background to compare with the individual's claims.