U.S. Senator Marco Rubio, an influential Republican on Latin American issues who will be at the summit with U.S. Vice President Mike Pence, said he wants the United States to make it clear China's involvement in the region was unacceptable.
The latest data showed China continues to benefit from the two-way trade.
The Yangtze river delta region, which comprises Jiangsu, Zhejiang and Anhui provinces and the city of Shanghai, saw PM2.5 levels fall 4 percent in March, but average levels rose 1.8 percent in the first quarter as a whole.
Analysts had expected imports to grow 10.0 percent in March, picking up from 6.3 percent growth in February.
But a stronger currency could also be starting to erode Chinese exporters' competitiveness.
During the first quarter, the levels of PM2.5 in the Beijing-Tianjin-Hebei region, which has been under heavy political pressure to tackle pollution, dropped 22.1 percent to 74 micrograms per cubic metre, down from near record highs in the same period of previous year.
While Trump has been impulsive and "ham-fisted", he said, "there are a lot of straws in the wind that could evolve into serious negotiation".
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Still, last month's surplus with the United States fell to $15.4 billion from February's $21 billion, while it was also down from $17.7 billion during the same period in 2017. But the solid global growth outlook may provide some buffer.
Indo-China cooperation is a good step, especially given their common energy needs and climate change goals.
However, for March the surplus fell to $15.4 billion from February´s $21 billion, while it was also down from $17.7 billion 12 months ago. The global trade balance often slips into deficit for one month early each year as factories restock following the Lunar New Year holiday.
But the sudden spike in trade tensions with the United States is clouding the outlook for both China's "old economy" heavy industries and "new economy" tech firms.
Exports increased by 14.8% while imports edged higher at 8.9%, prompting a plea from the customs administration spokesman, Huang Songping, for Washington to be "patient."
China runs multibillion-dollar monthly surpluses with Europe and the U.S., which helps to offset deficits with Japan, South Korea and developing countries that supply industrial components and raw materials.
Hi-tech products have been among its fastest growing export segments.
China struck back, targeting US farmers and pork producers, and an angry Trump then upped the ante and threatened duties on another $100 billion in imports - which have yet to be imposed.