"In my opinion this is not the way to best protect the US or any other country in relation to the serious concerns that exist about possibilities of terrorist infiltration. I don't think this is the effective way to do so. These measures should be removed sooner rather than later," Guterres told reporters here, responding to questions on the travel and refugee ban imposed by the US.
Guterres cautioned that banning people and refugees from entering other nations will not ensure that terrorists will not infiltrate as the extremist groups could circumvent measures and look at other ways to target nations and their citizens.
The international community is dealing with "very sophisticated global terrorists originations", he said, adding that if terror groups want to attack any country they will not send people with passports from "hotspots of conflict".
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On the possibility that the Trump administration will cut US funding to the UN, Guterres said he will not comment on something that has not yet occurred.
"Sometimes we talk too much about things that have not happened and when we talk too much about things that have not happened, you trigger the happening of those things. I will not be making comments on possibilities to enhance those possibilities to possibly be a reality," he said.
On the indefinite ban on Syrian refugees entering the US, Guterres said resettlement of refugees is in many situations the only possible solution.
"The US has always been in the forefront of refugee settlement and Syrians at the present moment have more dramatic needs in the world. I strongly hope that the US will be able to reassess its very solid refugee protection in resettlement and I hope Syrians will not be excluded in that process," he said.