I'm saying that calling for an investigation and threatening withholding foreign aid is acceptable when the Bidens may have broken American law.
What "American law" are you referring to? The
Foreign Corrupt Practices Act (15 U.S.C. §78dd-1),* prohibits certain American business entities from paying bribes to
officials of other countries. I'm not aware that President Trump or even any of his most ardent defenders has accused former Vice President Biden of violating it or any other federal statute.
The issue of Hunter Biden's business dealings in Ukraine was raised in 2015 by career officials of the U.S. State Department, who were concerned that it created the
appearance of a conflict of interest for the then vice president. (Biden-
père could only have had an actual conflict of interest if he had personally been receiving some of the income paid by the Ukrainian company to Biden-
fils, which no one has ever alleged.) When the State Department contacted Biden's staff to discuss the issue, an aide reportedly declined to raise it with the vice president, saying Biden didn't have the "bandwidth" to deal with Hunter Biden's business arrangements in Ukraine while his other son was dying of cancer.
___
*In 2017, President Trump reportedly told then Secretary of State Rex Tillerson to "get rid of the law" because it is "just so unfair that American companies aren’t allowed to pay bribes to get business overseas." Tillerson had to explain to Trump that an act of Congress is required to repeal a law.