According to the United States Agency for International Development (USAID), funding has decreased under the Trump administration.
Much of this decrease appears to be lowering aid values following a large spike in 2015/2016, and values for 2018/2019 are not fully reported/processed yet so the actual amounts are not yet known.
Select data taken from USAID's page on U.S. Foreign Aid by Country for Iraq:
Year Amount (dollars) Notes
2002 1,039,000 Pre-invasion
2003 3,849,469,396 Invasion year
2006 9,674,914,001 Highest value overall
2014 414,729,876 Post-invasion low point
2016 5,281,583,316 Highest since 2009
2018 1,481,722,677 Not fully reported yet*
2019 82,018,707 Not fully reported yet*
*According to USAID: There is a two year lag for the most recent complete year of data. This lag exists because foreign assistance data collection and reporting is approximately a year-long process from when the fiscal year ends.