Trump's budget calls for a third reduction in the State Department budget.
Improved trade links and an inside track on the Western Sahara issue are among the benefits.
The North African country left the bloc in 1983 due to a row over Western Sahara.
Mohamed Abdelaziz died on Tuesday after more three decades of war and diplomatic struggle for the disputed territory with Morocco.
Ban Ki-moon sparked a row with Morocco by describing the disputed territory as under "occupation."
Morocco and Ban Ki-moon's dispute is the most serious since the 1991 ceasefire in Western Sahara.
Morocco has pulled its personnel from a U.N. mission in the disputed region.
Ban Ki-moon recently referred to Morocco's presence in Western Sahara as "occupation."
Ban Ki-moon has described the conflict as a "forgotten humanitarian tragedy."
Moroccan authorities have blocked the first Ikea store opening in the country.