Trump announced last week a surprise decision to withdraw troops from Syria, where US has backed the Syrian Kurdish People's Protection Units (YPG) militia against Islamic State (IS).
Trump says construction of a wall along the US-Mexico border is needed to keep out illegal immigrants and drugs, but he has so far been unable to get congressional approval to do so.
Trump's decision, though applauded by US steel and aluminum producers, was strongly opposed by many who worry about a potential trade war with US trade partners, a disruption in the global trading system and a rising cost of raw materials for many US industries.
Trump campaign says to request recount in battleground state Wisconsin - World - Chinadaily.com.cn
Trump and his fellow Republicans have for weeks branded as illegitimate the work of committees probing Trump's overtures to Ukraine, arguing the full Democratic-led House of Representatives had failed to authorize their investigations in a public vote.
Trump, who has stepped up attacks against Mueller's probe and his team, has repeatedly denied allegations of collusion between his campaign and Russians, describing the Russia probe as a "hoax" or a "witch hunt."
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Trump and Erdogan exchanged views on ending the crisis in Idlib as soon as possible.
Trump's warning came hours after the Iraqi parliament on Sunday passed a draft law requiring the government to end the presence of foreign forces in Iraq, and prevent them from using Iraqi air, space and water.
Trump invited a bipartisan group of members of Congress for lunch on Tuesday to discuss the standoff but the White House said Democrats turned down the invitation. Nine House Republicans-none of whom are involved in party leadership-attended the private lunch.
Trump first announced the tariffs on March 1 after a Commerce Department investigation under the Section 232 of US Trade Expansion Act of 1962 that found the imports threaten to impair US national security.