Investing.com - U.S. President Donald Trump is to begin pushing his plan for tax reform this week. Trump flies to Springfield, Missouri to give a speech on Wednesday. It is the first in a series of appearances aimed at drumming up support for a revamp of the tax system. The speech will come just before Congress returns from its summer recess.When Congress returns on September 5, it will have a tight deadline to pass two critical pieces of legislation.It must pass a budget to keep the government running beyond September. Lawmakers must also raise the debt ceiling, to ensure that the U.S. does not have to default on its debt. But there are deep divisions about the details of tax reform. Some Republicans want any bill raising the debt ceiling to contain measures to cut the deficit. And relations between Trump and both Republicans and Democrats in Congress have soured in recent months.The process will also be complicated by Trumps insistence that a shutdown may be needed to ensure he gets funding for his U.S.-Mexico border wall.