Even if Congress gets them, you won't.
They’ll release what is in public interest to know.
Not legally they won't, it is a FEDERAL Felony to release someones tax info without consent.
Yes they can, if it's in the pubic interest to know.
26 U.S. Code § 6103 - Confidentiality and disclosure of returns and return information
There is NOTHING in that regulation that allows disclosure of specific persons information for anything other then CRIMINAL proceeds and then those proceeds must be specified before hand and no disclosure may occur to the PUBLIC. Try again.
Congress is not asking Trump to turnover his tax returns. They are asking the IRS. A 1924 law allows the chairman of the House Ways and Means Committee to examine anyone’s tax returns in private, without their permission. Secondly, congress has a responsibility to oversea the executive branch and to audit it's performance. In this case it is the IRS. According to Trump the agency has been auditing his returns now for 3+ years some over 5 years. Typically audits run 3 to 6 months and more complex cases they can run a 1 to 2 years but 3 to 5 years years would be very usually. Some of these returns go back over 7 years. Is the IRS sitting on those returns because the tax payer is the president?
Congress will get his tax returns. However, it may not help democrats at all. First because it may be too late to effect the election and secondly because there may be nothing there democrats can use against Trump. In which case it may help Trump. Proving Trump is unethical is not going to sway his base. That's one of the things they like about.