(Refiles to delete extraneous words in paragraph 1) By Andrew Chung and Nate Raymond WASHINGTON (Reuters) -The U.S. Supreme Court on Monday appeared inclined to make it easier to challenge the regulatory power of federal agencies in disputes involving the Federal Trade Commission and the Securities and Exchange Commission. The justices heard more than two hours of oral arguments, first in an appeal by Scottsdale, Arizona-based Axon Enterprise Inc after a lower court dismissed the Taser manufacturer’s lawsuit contesting the constitutionality of the FTC’s structure in a bid to counter an antitru…